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GUNS Magazine January 2012 Digital Edition - Page 52

Methods for solving angled shots using the Angle Indicators from Sniper Tools. M ost hunters understand the bullet goes high when shooting at an angle either up or down. For most however, deciding how much remains problematic. one reason centers around what approach to take. you need to know the angle or angle cosine in any case. once known, there are myriad methods to approach the problem. and an exact solution does exist. There are various ways to learn the angle at which the shot will be taken. One tool, and the best for use with small arms in my opinion, was developed by Ward Brien of Sniper Tools Design Company. This simple, yet innovative device attaches in various ways to the action or scope. The angle degree or angle cosine, depending on the model chosen, is immediately available. The indicator is in use on a wide range of military small arms, but it is also a great aid for hunters as well as Law Enforcement and can be attached to any rifle with a Picatinny rail or 30mm scope. No one wants to miss a trophy animal if it happens to be standing down in the canyon or up the ridge. Jacob Gottfredson angle drop table © Perry Systems (used with permission) Ammo: .308 WIN bullet: 175-grain Sierra MatchKing, 2,600 fps, AltituDe: Sea level, temperAture: 59º F, pressure: 29.53 Hg, scope: 1.5" above bore, zero: 100 yards angle: 0 10 20 30 40 50 60 70 coSine: 1.00 .98 .94 .87 .77 .64 .50 .34 range (yards) all comeups in Moa 100 0.00 0.00 -.25 -.25 -.50 -1.00 -1.25 -1.75 150 1.00 .75 .75 .50 0.00 -.50 -1.00 -1.75 200 2.00 2.00 1.75 1.50 .75 .25 -.50 -1.50 250 3.50 3.50 3.00 2.50 2.00 1.00 0.00 -1.00 300 5.00 4.75 4.50 3.75 3.00 2.00 .75 -.50 325 5.75 5.75 5.25 4.50 3.50 2.50 1.00 -.25 350 6.50 6.50 6.00 5.25 4.25 3.00 1.50 0.00 375 7.50 7.25 6.75 6.00 4.75 3.50 2.00 .25 400 8.25 8.25 7.50 6.75 5.50 4.00 2.25 .50 425 9.25 9.00 8.50 7.50 6.25 4.75 2.75 .75 450 10.25 10.00 9.25 8.25 7.00 5.25 3.25 1.00 475 11.00 11.00 10.25 9.25 7.75 5.75 3.75 1.50 500 12.00 11.75 11.25 10.00 8.50 6.50 4.25 1.75 Notes on using this information: The table the shooter carries to the field should include data for wind and moving target lead. These are not affected by angle fire and were left off in this chart for clarity. It is easy enough to print an all-in-1 chart. When angled fire is required, the rifleman need only look at the Angle Drop Table (for your caliber and conditions). There is no need to do any math. However, the exact angle or cosine of the angle at which the shot is taken requires one of the Indicators from Sniper Tools. The indicator uses high tech lubricants and operates from -30 to 300 degrees F. After it is leveled to the bore, the Indicator is flawless, operates without batteries and is impervious to water and other environmental conditions. Ups & Downs Of Comeups Many snipers and other shooters use “rules of thumb” methods to determine what adjustments to make when shooting up or down at an angle. These “rules of thumb” are approximations and work reasonably well in some circumstances, but perform very poorly in others. Unless taken from a modern ballistic program using differential equations of time and motion, these “ballpark” indicators are often far enough out of the park to cause misses on medium- to long-range targets, or to miss shortrange targets if they are small. Incline shooting takes skill in order to make productive hits, whether on the battlefield or in big-game hunting. This High Angle Training class was given by Jacob Bynum of Rifles Only and Frank Galli of Sniper’s Hide at Clint Smith’s Thunder Ranch. Photo: Frank Galli of Sniper’s Hide Rule Of Thumb: Method I This rule tells us to use: Cosine of angle times distance to target to get an effective “gravity distance.” It is seductively “RatheR than use Rules of thumb, why not let the compUter do itS thiNg and pRoduce a cRisply foRmatted table with the exact infoRmation needed. hence the exact “angle dRop table” featuRed in exbal. No mAth reqUired! No peNcil ANd piece of pAper reqUired either!” 52 W W W. G U N S M A G A Z I N E . C O M • J A N U A R Y 2 0 1 2

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