ASLI™ - Horus Vision
Contents
1.2. Angle Slope Level Indicator Model 2000 series User s Manual l d ic mm oy _ Thl July 08 2014 copyright 2014 Horus Vision LLC All rights reserved Patent Pending The ASL unit is a non restricted COTS item Written consent of Horus Vision LLC is required to copy or use any of the material in this manual l CONTENTS INNOdUCIO libici 3 FORNO a lilla ia 4 WhafisAhSASEblisurisorsa E 5 WhyowNeed4h6 Asturias a a EA 6 PECHO uessa OR E 7 The ASLlasSelt Adjusted tene dnd eccelsa 8 Versatile M nt ng Bologne 9 A Concise Discussion on the Effects of Shooting Up Hill or Down Hill ec eccceecseeeeeeeeeeeeeeeeeeeeeeees 10 Anatomy of Horizontal Uphill and Down Hill Shooting ceeeeeeeeeeeeeeeaeeeeeseeeeeeeeeeeeeesseeeeeaeeeeeesaees 11 Calculating the Corrected age ica alal iaia asia 16 Using the ASLI to Accurately Calculate Range iii 19 BUbbpleLevel sleale 20 Cillabialo p DM PR RM eae ee 21 How to Use the Cant Indicator level DUDDIE i 22 Using the ASLI for Rifle Fired Grenades iii 23 How to Properly Mount the ASLI to the Weapon nnns 24 Properly Mounting ine ASEEURIE sorella 25 Care oFincASE MARIO ptr 28 I palr amp MalnlenanGe uc bidielle 28 Related Horus Vision gie decer ES 28 Word of Caution Regarding the Level of Your Shooting SySstem 29 APPENA ET 30 ANETE E PER EE I UL
3. 18 USING THE ASLI TO ACCURATELY CALIBRATE RANGE Many riflemen passively range uphill and downhill targets using the calibrated reticle in their rifle scopes The ASLI is an essential tool when using the known height of a target to calculate range If the rifleman fails to factor in the angle of observation the calculated range will be incorrect The following example using Horus Vision s ATRAG Software illustrates how range can change A rifleman on a high ledge spots a target in a deep valley below him Next to the target the rifleman notes an object in a vertical position From experience he knows it is 36 in length He mils the target noting that it subtends covers exactly 1 mil on his vertical crosshair Next he places the 36 object on his main crosshairs noting a reading of 30 degrees on his ASLI 1 Computer method Target Range Estimator Target Range Estimator When using WIDTH to size a target When using WIDTH to size a target Jp Dwn Angle does nat effect range UpiDwn Angle does not effect range calculation but will effect bullet drop calculation Dut will effect bullet drop Heigat Height Target Sze EA O degrees ansi Uncorrected Range Corrected Range The shooter failed to factor in Angle of Fire The shooter successfully factored in Angle of Fire 2 Manual method Example calculated in yards 36 target x 1000 constant 36 per yard BBE X cosine value 866 yards on ASLI 1 mi
4. LL E TI 31 Legal eileM t TN 32 CondclLesl CRI 33 INTRODUCTION ABOUT HORUS VISION Horus Vision s cutting edge technology improves shooting accuracy at extended ranges and increases the likelihood of a first round hit Our patented reticles reduce the need for manual scope manipulation and mental calculation Horus Vision s simplified shooting system improves accuracy at any distance and can make anyone an expert marksman Horus Vision s ATrag ballistics software algorithms were developed and refined by the former chief of ARDEC s small arms division William C Davis Horus Vision was founded in 2000 and is headquartered in San Bruno California SAFETY WARNING Always use great care with all firearms A mistake in judgment or lapse of attention can result in serious injury or death The information in this manual while believed to be accurate at the date of publication is not warranted or represented to be accurate correct or useful for any particular purpose Use the information in this manual with caution and common sense and verify it with respect to your own firearms before use The author and publishing company accept no responsibility for errors in the information presented herein or for accidents injuries damage or any other problems which might arise as a result of your use of the information contained in this book and expressly disclaim all liabilit
5. components of the shooting system This method entails the following First set the rifle Stock up in a rest and check to make sure it is level with a bubble level device Second mount the barreled action into the stock and check the action with a bubble level device to ensure that it is also level with the stock Third mount the scope base to the receiver and ensure that it is level with a bubble level device Forth verify that the centerline of the stock receiver scope mount and barrel are the same Fifth mount the scope rings to the scope base and check the level of the rings as well as the centerline Sixth mount the scope in the rings using a bubble level device to ensure the scope is level Scope rings should also be lapped to ensure that they are in line and do not bind the scope in any way Finally while the shooting system is still in the mount and all elements have been verified as noted above mount the ASLI unit to the scope tube body or the scope mount using the ASLI s bubble level to ensure the ASLI is level External level method 26 AFTER MARKET MOUNTING DEVICES After market mounting devices are acceptable for mounting the scope to the shooting system However unless all of the elements of this system are checked as noted above in the Level Method the entire system s level and bore line will be suspect and should be proven using the Horus Vision CATS system noted below After market mounting d
6. of uphill and downhill target engagement as well as Cant Since this is a subject that is rarely dealt with this manual explains these principals in great detail Some sections appear to be repetitive but this is to ensure a thorough understanding of the subject The ASLI precisely measures the Angle of Fire in uphill and downhill shooting It gives you the information you need to accurately calculate holdover for gravitational bullet drop assuring a first round hit Without this measurement the rifleman cannot correctly calculate gravitational adjustment And at ranges greater than 400 yards that means missed shots Simply put if you don t calculate and compensate you miss The ASLI also helps eliminate Cant errors It indicates whether your rifle is positioned perpendicular to the earth At ranges past 400 yards the slightest tilt leads to left right bullet drift and missed shots The ASLI is an essential tool for the professional rifleman Angle of Fire given by ASLI use this angle to calculate True Measured Range to Target Gravity Horizontal Distance to Target use this distance fo compensate for gravity WHAT IS THE ASLI ANGLE SLOPE LEVEL INDICATOR The ASLI is two instruments in one It is a precision bubble level for eliminating Cant And it is a precision angle indicator for accurately engaging uphill and downhill targets This small precision instrument is specifically designed and engineered to
7. TMR True Measured Range to Target x ASLI Cosine Range adjusted for angle of fire Consider the following example 600 yards x 87 Cosine value of a Slope Angel of 30 degrees 522 yards In the above example you would use your come ups or hold for a 522 yard target when shooting at a target that is 30 degrees above or below you with a True Measured range of 600 yards Once you have computed the Horizontal Distance to the Target 522 yards in this example you can apply any method of manually computing the correct holdover Note that all corrections for windage must use the True Measured Range to Target 600 yards in this example 16 Windage Bullet Drop Compensation Gravity Pal Horizontal Distance to Target you need this distance to calculate correct holdover for bullet drop 2 Digital Aiming Program Method using a PDA computer Using a PDA Handheld Computer with Horus Vision ATRAG Software is the most accurate method available Regardless of whether the target is positioned uphill or downhill the following information is necessary 1 True Measuredrange to the target the value measured by a laser rangefinder optical range finder such as one found in the Horus Vision Reticles mil dot etc 2 Angle of Fire obtained from the ASLI reading noted above The ASLI indicator wheel indicates the shot s Angle of Fire Once this angle is entered into a digital aiming program the necessary adjustment
8. angefinder the riflescope s reticle or an optical range finder Accurate measurement of the distance is very important because it allows you to calculate an accurate horizontal distance Also the True Measured Range allows you to calculate the correct windage adjustment 3 The Horizontal Distance from the Rifle to the Target is always shorter than the True Measured Range to the Target Here s a simple formula for finding the horizontal distance to the target True Measured Range to Target x Cosine from ASLI Horizontal Distance to Target 14 4 The following example shows how this simple formula works of Horizontal Distance to Target use the formula to find this distance Thus we know the Horizontal Distance to Target is 522 yards Knowing the Horizontal Distance to Target allows the rifleman to quantitatively factor the influence of gravity on the bullet s flight for downhill shooting 5 For downhill shooting the rifleman needs to know the following a If the Angle of Fire is 15 degrees or less with targets out to 500 yards meters the adjustment is so small that a calculated firing solution for uphill high Angle fire is not necessary b If the Angle of Fire is greater than 15 Degrees and you do not calculate the corrected firing solution the bullet will strike high c As the Angle of Fire increases or the range to the target increases or both a corrected firing solution is required using the ASLI Not corre
9. be attached to a scope or scope base Bubble level Dove tail mounting groove for Picatinny or Weaver style ring Indicator wheel Cosine scale Degrees scale WHY YOU NEED THE ASLI For accurate uphill and downhill shooting you must know your rifle barrel s precise Angle of Fire Without this crucial information you can t calculate correct compensation for gravitational bullet drop If you don t calculate and compensate you ll simply miss your shot The ASLI gives the exact information you need for first round hits Its angle indicator quickly and easily shows your precise Angle of Fire You can then properly calculate correct adjustment for the affects of natural gravity on the shot Additionally the ASLI s bubble level helps you avoid misses caused by Cant It is a simple low tech device allowing you to keep your rifle perpendicular to the earth And at extended ranges even the slightest errors in Cant mean missed shots With the ASLI you ll make precision first round hits at any distance SPECIFICATIONS Height 1 8 inch 4 6 cm Width 1 5 inch 3 8 cm Depth 0 8 inch 2 1 cm Weight 1 5 oz 42 5 gr 2 0 oz with cover Housing Backside hardened Ballistic Polymer Clear Cover high impact poly carbonate frosted for reduced glare in bright conditions Angle Indicator Wheel Precision machined aluminum to a tolerance of 004 All markings of calibration are 360 degrees laser engraved Calib
10. cting for both the angel and or distance will result in a complete miss Hence a lost opportunity 15 CALCULATING THE CORRECTED RANGE HOW TO FIND THE ANGLE OF FIRE From the firing position look through the rifle scope at the target With the opposite eye or even the same eye look at the red line on the ASLI Note the numerical angle or cosine value directly behind the red line Cosine values are shown on the outer scale the row of numbers closer to the dovetail as decimal numbers like 80 Degrees are shown on the inner scale the row of numbers farther away from dovetail as whole numbers like 40 There are two different methods for calculating the corrected range necessary to compute a holdover value the Manual Calculation Method using the cosine value and the Digital Aiming Program Method 1 Manual Calculation Method using the cosine value The following information is necessary for both uphill and downhill shots 1 True Measured Range to Target This distance is measured by a laser rangefinder optical range finder or mil dot reticle in a riflescope From the shooting position observe the target and measure the distance 2 Angle of Fire This is obtained from the ASLI While looking through the rifle scope place the target on the central cross hairs and note the ASLI cosine value Be sure to use the decimal number on the ASLI s outer scale To calculate the corrected range use the following formula
11. e it allows the calculation of an accurate horizontal distance Also the true measured range allows the calculation of the correct windage adjustment For Uphill shooting the rifleman needs to know the following a If the Angle of Fire is 15 degrees or less with targets out to 500 yards meters the adjustment is so small that a calculated firing solution for uphill fire is not necessary b If the Angle of Fire is greater than 15 degrees and you do not calculate the corrected firing solution the bullet will strike high c As the Angle of Fire increases or the range to the target increases or both a corrected firing solution is required using the ASLI Not correcting for both the angel and or distance will result in a complete miss 13 DOWNHILL SHOOTING Downhill shooting occurs when the rifle barrel is pointed toward a target that is lower than the rifle Examples include shooting from a mountain top down into a valley shooting from the top of a building to a target at street level or shooting from a helicopter Basic Diagram of Down Hill Shooting Angle of Fire given by ASLI Use angle to calculate True Measured Range to Target Horizontal Distance to Target Use this distance to compensate for gravity 1 The Angle of Fire can be measured by the ASLI unit The measurement calibration value is either in degrees or cosine value 2 The True Measured Range From The Rifle To the Target is determined by using a laser r
12. evel Then attach the ASLI unit to either the scope tube or the scope mount and center the bubble on the bubble level of the ASLI unit to conform to the spirit level noted above Then tighten the ring or mount on the ASLI unit making sure the respective bubbles have the same reading when the ASLI is firmly mounted e Next turn the spirit level used above so as to measure the level of the scope base Adjust the rifle in the rest until the bubble is centered Check the ASLI gauge it should be on Zero If you are using either a sloped scope base or slopped rings the ASLI unit should have a reading equal to the slope of your base or rings You should make a note of this number as the ASLI unit will read a slight angle when the rifle is in fact in a completely level position This small deviation should not be a material factor but you should be aware of it in the event that you are continually off at long distances 25 THE EYE BALL METHOD Simply stated the eyeball method requires setting up the rifle system on a rest leveling it based on how well it looks to the eye and then mounting the ASLI unit so that the level bubble is centered This method is OK for shorter range shooting It is OK for long distance shooting ONLY IF it is further adjusted by using the Horus Vision CATS system see CATs manual on Horus Vision website www HorusVision com THE LEVEL METHOD The level method utilizes external levels to check all of the
13. evice Reticle Leveler 27 CARE OF ASLI UNIT The Horus Vision ASLI Unit is a sealed nitrogen filled unit which is magnetically dampened to prevent wheel oscillation It is not engineered to be disassembled in the field Cover Each ASLI unit comes with a rugged rubberized cover attached with a lanyard to the unit When not is use the ASLI unit should have this cover firmly in place to protect it from inadvertent damage Solvents and Cleaners The ASLI unit s housing is impact resistant It s strong clear acrylic is resistant to abrasions It is also resistant to solvents and cleaners Therefore there are no concerns when cleaning the weapon The surface should be cleaned with a damp soft cloth when dirty Shock Resistant The ASLI unit is tested to withstand the shock of impacts caused by dropping the weapon However if that occurs the unit should be checked to ensure that the resulting impact did not shift the mounting device Housing While it is not advisable to stand on the ASLI unit the unit housing is strong enough to withstand the pressure in excess of 200 pounds When the housing needs to be cleaned use a damp soft towel REPAIR AND MAINTENANCE The ASLI is a hermetically sealed unit which cannot be field repaired Any equipment failure should be returned to Horus Vision LLC using a Return form A replacement unit will be forwarded within 10 business days of receipt RELATED HORUS VISION PRODUCTS The profes
14. fle was not held exactly perpendicular and was tilted slightly to the left You can visually see a horizontal displacement to the left and a vertical displacement downward Horus Series Il CATS V targets show the maximal lateral displacement based on the elevation selection you are shooting The lateral distance shown on the target gives you feedback information needed to correct Cant By correcting Cant you eliminate lateral movement displacement and slight vertical displacement Verticle crosshair must be perpendicular to the earth bubble must be centered 20 mals 20 mils or 72 MOA Mu Elevation Site approximate hold for 336 Lapau for 1 00 yard shot 1 Vertical component i impact point 2 be Horizontal component Actual bullet impact point 10 mals n 10 mils or 36 MOA Elevation approximate hold for 338 Lapau for 1200 Elevation for range is yard shot achieved by using the limes on the Horus reticle or by clicking the elevation knob on a standard mil dot scope Target aim point O mils a Rifle sighted in 100 yards 21 HOW TO USE THE CANT INDICATOR LEVEL BUBBLE For the right handed shooter while looking through the scope with the right eye open the left eye to note the position of the bubble level on the ASLI unit Adjust the level of the rifle accordingly until the bubble is centered For the left handed shooter while looking through the sco
15. is instantly calculated for accurate hold compensating for Angle of Fire For example Horus Vision s ATRAG software provides a Target screen The IA Inclination Angle line provides an input field for entering the angle indicated on your ASLI wheel When this number is entered along with ballistic and environmental data temperature wind etc the system automatically computes the corrected hold in mil radians clicks or MOA THIS IS THE MOST ACCURATE METHOD WITH FEW IF ANY MISSED SHOTS 17 Example You are positioned on a high ridge on a mountain pass with your 300 win mag rifle You have spotted a target on a trail below your position Your laser range finder indicates a True Measured Range or target of 1000 yards The ASLI on your rifle scope shows an angle of 30 degrees You now enter the True Measured Range to Target 1000 yards and the ASLI reading 30 degrees into your Horus Vision ATRAG PDA aiming software It instantly computes a precise firing solution Shooting 300 win MAG from high mountain ridge Angle of Fire 30 degrees given by ASLI n Angle on ASLI True Measured Range to Target 24 3 MOA or 7 06 MILs with angle correction True Measured Range to Target 28 5 MOA or 8 33 MILs without angle correction w Horus Norm Horus Corrected Range Uncorrected Range The shooter successfully factored in Angle of Fire The shooter failed to factor in Angle of Fire
16. l subtended in scope Note very important Only apply the above method for objects in vertical position If the object yourre ranging is in a horizontal position do not factor in the angle measurement from the ASLI unit 19 BUBBLE LEVEL The Bubble Level embedded in the ASLI unit is a precision device the rifleman can use to keep his rifle level and perpendicular to the earth When the ASLI unit is properly mounted and adjusted the bubble level reflects the rifle s true perpendicular position in relation to the earth If the rifleman makes reasonable effort to keep the rifle in a vertical position shooting out to 400 yards meters will present no significant Cant problems However beyond 400 yards meters Cant becomes progressively worse and dramatically increases the probability of missed shots Beyond 400 yards meters you must use the ASLI s bubble level Not level Cant Level Not level Cant 20 CANT The word cant describes bullet drift resulting from not holding the rifle perpendicular to the earth To shoot accurately at extended range the rifle must be in a level perpendicular position Failure to maintain a level position will cause the shot to vary to the left or right of the target resulting in missed shots The greater the Cant the greater the probability of a missed shot This is especially true as range increases The following diagram illustrates the effects of Cant In this example the ri
17. marks of Horus Vision LLC and may not be used in any manner without express permission from Horus Vision LLC Horus Vision software products and written and visual materials are protected by U S and international copyright protection and may not be used in any manner without express permission from Horus Vision LLC A wide variety of scopes reticles software computer systems and other products associated with shooting and ballistics Horus Vision systems are exclusively owned by Horus Vision LLC and are protected by issued patents in the United States including U S Pat Nos 5 920 995 6 032 374 6 453 595 6 516 699 and 6 681 512 issued foreign counterparts as well as numerous additional pending patent applications in the United States and foreign jurisdictions including but not limited to Europe Japan Israel Canada and Australia Manufacture sale importation or use of the Horus Vision systems requires a license from Horus Vision LLC For more specific information on obtaining a license please contact Horus Vision LLC Nothing contained herein should be construed as granting by implication estoppels or otherwise any license or right to use any Horus Vision LLC intellectual property 2013 Horus Vision LLC All rights reserved 32 CONTACT Horus Vision LLC 598 San Mateo Avenue San Bruno CA 94066 Phone 650 588 8862 Fax 650 588 6264 E mail info horusvision com Website www horusvision com 33
18. ntered on zero VERSATILE MOUNTING OPTIONS The Horus Vision ASLI unit is the most versatile instrument of its type on the market today It can be mounted in four configurations Right handed shooter bubble level up Left handed shooter bubble level up Mounted on left side of the optic for Mounted on right side of the optic for right handed shooters with bubble level on left handed shooters with bubble level on the top the top Left handed shooter bubble level down Mounted on right side of the optic for left handed shooters with bubble level on the bottom Right handed shooter bubble level down Mounted on left side of the optic for right handed shooters with bubble level on the bottom A CONCISE DISCUSSION OF THE EFFECTS OF SHOOTING UPHILL OR DOWNHILL By Bill Davis The vertical drop of a bullet below its line of departure is practically the same whether the target is uphill downhill or at the same level as the rifle That does not imply however that the sight adjustment or the allowance in aiming required to hit a target at any range is unaffected by the slope of the rifle target line The reason for this apparent contradiction is that the effects of an aiming allowance or elevation adjustment of the sight are in a plane perpendicular to the line of sight which in the case of up hill or downhill firing is not the same as the vertical plane in which the bullet drop is measured The reason we must take account of the sl
19. ope of the rifle target line is illustrated in the following examples 1 Suppose we are firing a 30 caliber 180 grain bullet having a ballistic coefficient or C1 450 and a muzzle velocity of 2600 fps under standard sea level atmospheric conditions and that we have sighted in the rifle at 200 yards Suppose further that we wish to shoot at a bull s eye on a tall vertical target 700 yards away on the same level as the rifle We can calculate that if we were to fire with the sight adjusted for the sight in range of 200 yards the bullet would strike about 147 inches low on the vertical target Therefore to hit the bull s eye we must either 1 aim 147 inches high or 2 make an elevation adjustment of about 21 MOA 147 7 on the sight 2 Now suppose that all the conditions are the same as those described above except that the tall vertical target is on higher ground at an uphill angle of 30 degrees Since the vertical drop of the bullet is the same as before the bullet would strike the vertical target at a point 147 inches below the bull s eye if we fired with the sight adjusted for the sight in range However as we look upward at a 30 degree angle toward the target the vertical line between the bullet hole and the center of the bull s eye would to be less than 147 inches long because of the angle from which we are viewing it We can calculate by trigonometry that a vertical line 147 inches long would appear to be only about 127 inches 147 x c
20. osine 30 degrees when viewed from a location 30 degrees below Therefore we could hit the bull s eye by 1 aiming 127 inches high or 2 by making an elevation adjustment of about 18 MOA 127 7 on our sight By reasoning similarly we can see that a 147 inch vertical line would appear to be about 127 inches long when viewed from 30 degrees above the target as well as from 30 degrees below and therefore the same allowance in elevation must be made in either case 10 ANATOMY OF HORIZONTAL UPHILL AND DOWNHILL SHOOTING Notes Uphill shooting can also be called high angle fire from 0 to plus 90 degrees Downhill shooting can also be called low angle fire from 0 to minus 90 degrees Horizontal is level shooting neither up nor down HORIZONTAL SHOOTING Horizontal shooting occurs when the rifle barrel and target are the same height off the ground The rifle barrel and target are in the same horizontal plain Horizontal Distance to Target 0 1 The angle of fire in horizontal shooting is 0 degrees 2 The horizontal distance to the target and the true measured range to the target are exactly the same The bullet or projectile is under the influence of gravity for this distance There is no effect from Angle of Fire For Horizontal Shooting no correction or hold over adjustment is necessary 11 UPHILL SHOOTING Uphill shooting occurs when the rifle barrel is pointed toward a target that is higher off of
21. pe with the left eye open the right eye to note the position of the bubble level on the ASLI unit Adjust the level of the rifle accordingly until the bubble is centered Right handed Cant usage Left handed Cant useage 22 USING ASLI FOR RIFLE FIRED GRENADES When firing a rifle grenade the rifleman must know the range to the target Using a range table based on the Angle of fire verses the range he selects the correct angle that will give the range desired With both eyes open he views the target through the rifle scope while keeping the main cross hairs on the target With the other eye he views the ASLI to ensure the rifle is being held at the correct angle and that the bubble on the ASLI is centered He is now ready to fire Most range tables for the rifle fired grenade are generated by the field method try and record Simply a grenade is fired at various angles and the impact range is recorded thereby creating a firing table 23 HOW TO PROPERLY MOUNT THE ASLI TO THE WEAPON The ASLI unit is shipped with the 34mm ring and 30mm adapter inserts attached to the unit Follow these steps to mount the ASLI to your scope tube 1 Using the hex key that shipped with your unit remove the screws holding the ring together 2 If your scope tube requires a 34mm ring remove the 30mm inserts 3 The ring should then be mounted directly to the scope body either on the right or left side forward or aft of the adjusting turre
22. ration Markings o Designed to be read and used from any of the 4 mounting positions o To facilitate different shooters and methods that they employ to calculate hold the ASLI incorporates 2 scales of measuring angles Outer Ring Calibrated in Cosign Inner Ring Calibrated in Degrees The Indicator Wheel is self adjusting to 0 degrees Additional Information Rare Earth Magnets damp Indicator Wheel isolation Leveling Bubble is a precision bubble level enclosed in a precisely machined portion of the clear hi impact Polycarbonate cover All secondary 2nd parts are precision machined to insure proper fit and functionality The ASLI is Dry Nitrogen Purged and hermetically sealed The ASLI is dust proof The ASLI is water proof to 20 meters in depth The ASLI is shock proof The ASLI unit has no batteries and no illumination signature The ASLI unit comes equipped with a rubber cover to protect it in the field when not in use Note The ASLI is a ruggedized unit specifically designed to be used with heavy recoiling rifles under adverse conditions The ASLI is not designed to withstand deliberate abuse or severe mishandling THE ASLI IS SELF ADJUSTING The ASLI is a self adjusting unit When correctly mounted it automatically adjusts to zero There are no internal or external adjustment screws For proper mounting instructions see section Properly Mounting the ASLI unit Note that scale is ce
23. sional rifleman requires precision tools in order to hit the target at extended ranges The ASLI is just one part of the Horus Vision Shooting System To complement the ASLI we recommend the following Horus Vision System components ATRAG Ballistic Aiming Software for Hand Held PDA Palm and Windows operating systems CATS Combination Accuracy Targeting System Horus Vision Patented Reticles available in the following scopes Schmidt amp Bender Zeiss Leupold US Optic and Horus Vision 28 WORD OF CAUTION REGARDING THE LEVEL OF YOUR SHOOTING SYSTEM A word of caution is needed due to the very nature of the elements comprising your shooting system These elements are e The stock e he action e The barrel e The scope mount e The scope mounting rings e The scope reticle windage and elevation adjustments Each is an independent component which to perform correctly must be in a level condition and lined up concentrically i e the line of the bore must be in line with the line of the receiver which must be in line with the scope mount which in turn must be in line with the scope etc If any of these components are not aligned and accordingly adjusted before usage for example the scope s windage adjustment your system will not allow for accurate shots at extended distances Worst of all the rifleman will not know how or why this is the case There is only one system that absolutely and positively enables the rifleman
24. the ground than the barrel Examples include shooting from a valley floor up to a high ledge or shooting from street level to a target on a tall building Basic Diagram of Up Hill Shooting Angle of Fire given by ASLI Use angle to calculate True Measured Range to Target Horizontal Distance to Target Use this distance to compensate for gravity 1 The Horizontal Distance from the Rifle to the Target is always shorter than the True Measured Range to the Target Here s a simple formula for finding the Horizontal Distance to Target True Measured Range to Target x Cosine from ASLI Horizontal Distance to Target The following example shows how this simple formula works Horizontal Distance to Target use the formula to find this distance 600 yards x 87 cosine 522 yards Thus we know the Horizontal Distance to Target is 522 yards 12 Knowing the horizontal distance to the target allows the rifleman to qualitatively factor gravity for uphill shooting The rifleman can then calculate accurate holdover for gravitational bullet drop assuring a first round hit 2 The Angle of Fire can be measured by the ASLI unit The measurement calibration value is either in degrees or cosine value The True Measured Range from the Rifle to the Targetis determined by using a laser rangefinder the reticle in the rifle scope or an optical range finder Accurate measurement of the distance is very important becaus
25. to both prove the shooting system and make the necessary adjustments to eliminate any discrepancies That system is the Horus Vision CATS target system If you intend to engage targets at ranges in excess of 1000 yards you must use a Horus CATS Series Il Target see CATS manual on Horus Vision website www HorusVision com 29 APPENDIX This chart shows the mathematical relationship between Cosine and Degrees Angle Firing Chart Any caliber and velocity UP or DOWN Slope Slope Angle Cosine Angle 30 BT 60 50 B5 46 BZ A B 67 38 uri 4 74 30 FO 26 67 22 84 Tf 61 13 LI 08 54 05 80 00 Formula Slope Range x Cosine of Slope Angle Horzontal Range 30 WARRANTY The ASLI is a hermetically sealed unit designed to be maintenance free Should it fail for any reason no attempt to repair it in the field should be made The unit carries the following guarantee 1 30 day money back guarantee if product is returned un used 2 Full Replacement within 10 business days from arrival in our offices in San Bruno CA if product fails within 2 years from the date of purchase as a result of manufacturing or material defect normal wear and tear accepted 3l LEGAL NOTICE HORUS VISION and the EYE OF THE FALCON logo are registered trademarks of Horus Vision LLC and may not be used in any manner without express permission from Horus Vision LLC SECOND SHOT TACTICAL SOLUTIONS and TARGETING SOLUTIONS are trade
26. ts It is recommended that the ASLI unit be mounted to the front of the turrets if possible as this position gives the clearest unobstructed view of the ASLI 24 PROPERLY MOUNTING THE ASLI UNIT Even though the ASLI is a self adjusting unit the rifleman still has the final responsibility to correctly mount the unit to his weapon There are a number of methods These include e The Eye Ball Method e The Level Method e Use of after market scope mounting devices e Use of Horus Vision s CATS system No matter which method is used the following mounting techniques should be employed First MAKE ABSOLUTELY CERTAIN THAT THE WEAPON IS EMPTY If it is a bolt gun remove the bolt When mounting the ASLI unit to your rifle care should be taken to ensure that both the optic and the scope mount are mounted correctly on the rifle before mounting the ASLI unit to either of these items Additionally the decision regarding the location of the ASLI unit should be made taking into consideration both the protrusions on the scope or rifle plus the eye relief of the individual rifleman Mount the unit far enough away from the rifleman s eye to ensure that the ASLI indicator wheel is in full focus The following technique should be used e Ensure that the rifle is completely level prior to mounting the ASLI unit Place the rife in a steady rest and place a spirit level on the flat service of the scope mount making sure the bubble is l
27. y for injuries death and damages whether direct incidental consequential punitive or otherwise FORWARD The Angle Slope Level Indicator ASLI was developed out of sheer necessity to compliment our System 5 family of long range shooting products No accurate self adjusting Angle of Fire indicator existed on the market that could be used with the Horus Vision Systems We therefore designed our own It includes a bubble level Cant indicator that works with our overall ergonomic design The ASLI is engineered constructed and patented by Horus Vision LLC The ASLI is a precision unit that does not require batteries We deliberately avoided any and all types of illumination Numerous devices exist to locate illumination Even the smallest illumination can be detected with terminal consequences for the military rifleman One must remember that laser rangefinders illuminated reticles in optical devices splash from night vision devices illuminated dials on wrist watches etc all have an optical signature The rifleman must face the reality that the earth s topography is not completely flat With Horus Vision s technology riflemen now accurately engage targets past 2 000 meters As range increases accurate Angle of Fire calculation and proper adjustments for Cant elimination determine the shot s success or failure Many authors of operational manuals and books on police and military sniping totally avoid the subject
Download Pdf Manuals
Related Search