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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Crosshair positions for Long Range Shooting
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<blockquote data-quote="Dave King" data-source="post: 115241" data-attributes="member: 3"><p>Measure the distance with the scope at high power and them measure again at low power, it the measured distance doesn't change then the power setting won't matter, otherwise you'll need to calibrate the scope at a set power value.</p><p></p><p>If you measure at 100 yards and the value is for example '8' inches from center "+" to tip of the bottom bar you can (approximate value here for ease) straight convert to 8 MOA (in reality it'd be something like 7.640879 MOA but we'll just call it 8 because I'm sort of lazy).</p><p></p><p> If you zero your rifle to be "dead on" at 300 yards you then determine the trajectory further out where you need 8 moa of correction UP and that is your distance where the tip of the lower bar is the zero.</p><p></p><p> <font class="small">Code:</font><hr /><pre></p><p></p><p>Range Vely Energy Total Bullet MOA</p><p>yds fps ft/lbs Drop Path Drop</p><p>0 3050 3924 0.0 -1.8 0.0 </p><p>25 3006 3811 -0.1 -0.1 -0.5 </p><p>50 2962 3701 -0.5 1.2 2.3 </p><p>75 2920 3596 -1.1 2.4 3.0 </p><p>100 2877 3491 -1.9 3.2 3.1 </p><p>125 2835 3390 -3.1 3.8 2.9 </p><p>150 2794 3293 -4.4 4.2 2.7 </p><p>175 2752 3194 -6.2 4.2 2.3 </p><p>200 2712 3102 -8.1 4.0 1.9 </p><p>225 2671 3009 -10.4 3.4 1.5 </p><p>250 2631 2920 -12.9 2.6 1.0 </p><p>275 2591 2831 -15.8 1.4 0.5 </p><p>300 2552 2747 -19.0 0.0 0.0 </p><p>325 2513 2664 -22.5 -1.8 -0.5 </p><p>350 2474 2581 -26.4 -3.9 -1.1 </p><p>375 2436 2503 -30.5 -6.4 -1.6 </p><p>400 2398 2425 -35.1 -9.2 -2.2 </p><p>425 2360 2349 -40.1 -12.5 -2.8 </p><p>450 2323 2276 -45.4 -16.1 -3.4 </p><p>475 2286 2204 -51.2 -20.1 -4.0 </p><p>500 2249 2133 -57.5 -24.6 -4.7 </p><p>525 2213 2065 -64.0 -29.5 -5.4 </p><p>550 2177 1999 -71.1 -34.8 -6.1 </p><p>575 2141 1933 -78.7 -40.7 -6.8 </p><p>600 2105 1869 -86.9 -47.1 -7.5 </p><p>625 2070 1807 -95.3 -53.8 -8.2 </p><p>650 2036 1748 -104.0 -60.8 -8.9 </p><p>675 2001 1689 -113.5 -68.6 -9.7 </p><p></p><p> </pre><hr /></p><p></p><p></p><p>Notice in the above chart (3050 fps muzzle, 190gr bullet .550BC, 59degrees, 500' above sea level) that at 300 yards the bullet path and MOA drop are -0-. Notice that when the MOA drop = ~8 the distance (yards) is between 600 and 625. This yardage of 600 - 625 is where you should be Point-Of-Aim = Point Of Impact when using the tip of the bottom bar --- this is an example --- you must measure your scope and recalculate.</p><p></p><p>(Okay guys, did I get it close to correct? Someone double check me but I should be fairly close using the ~MOA values)</p></blockquote><p></p>
[QUOTE="Dave King, post: 115241, member: 3"] Measure the distance with the scope at high power and them measure again at low power, it the measured distance doesn't change then the power setting won't matter, otherwise you'll need to calibrate the scope at a set power value. If you measure at 100 yards and the value is for example '8' inches from center "+" to tip of the bottom bar you can (approximate value here for ease) straight convert to 8 MOA (in reality it'd be something like 7.640879 MOA but we'll just call it 8 because I'm sort of lazy). If you zero your rifle to be "dead on" at 300 yards you then determine the trajectory further out where you need 8 moa of correction UP and that is your distance where the tip of the lower bar is the zero. <font class="small">Code:</font><hr /><pre> Range Vely Energy Total Bullet MOA yds fps ft/lbs Drop Path Drop 0 3050 3924 0.0 -1.8 0.0 25 3006 3811 -0.1 -0.1 -0.5 50 2962 3701 -0.5 1.2 2.3 75 2920 3596 -1.1 2.4 3.0 100 2877 3491 -1.9 3.2 3.1 125 2835 3390 -3.1 3.8 2.9 150 2794 3293 -4.4 4.2 2.7 175 2752 3194 -6.2 4.2 2.3 200 2712 3102 -8.1 4.0 1.9 225 2671 3009 -10.4 3.4 1.5 250 2631 2920 -12.9 2.6 1.0 275 2591 2831 -15.8 1.4 0.5 300 2552 2747 -19.0 0.0 0.0 325 2513 2664 -22.5 -1.8 -0.5 350 2474 2581 -26.4 -3.9 -1.1 375 2436 2503 -30.5 -6.4 -1.6 400 2398 2425 -35.1 -9.2 -2.2 425 2360 2349 -40.1 -12.5 -2.8 450 2323 2276 -45.4 -16.1 -3.4 475 2286 2204 -51.2 -20.1 -4.0 500 2249 2133 -57.5 -24.6 -4.7 525 2213 2065 -64.0 -29.5 -5.4 550 2177 1999 -71.1 -34.8 -6.1 575 2141 1933 -78.7 -40.7 -6.8 600 2105 1869 -86.9 -47.1 -7.5 625 2070 1807 -95.3 -53.8 -8.2 650 2036 1748 -104.0 -60.8 -8.9 675 2001 1689 -113.5 -68.6 -9.7 </pre><hr /> Notice in the above chart (3050 fps muzzle, 190gr bullet .550BC, 59degrees, 500' above sea level) that at 300 yards the bullet path and MOA drop are -0-. Notice that when the MOA drop = ~8 the distance (yards) is between 600 and 625. This yardage of 600 - 625 is where you should be Point-Of-Aim = Point Of Impact when using the tip of the bottom bar --- this is an example --- you must measure your scope and recalculate. (Okay guys, did I get it close to correct? Someone double check me but I should be fairly close using the ~MOA values) [/QUOTE]
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