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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Help with a scope? I think it is really a MOA question
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<blockquote data-quote="kraky" data-source="post: 127277" data-attributes="member: 180"><p>I contacted Burris and asked what MOA the extra crossmarks are set at. They acted like I was from Mars. So, I did a little research and found that 1 MOA= 1.047". I divided the inch correction at 100 yds by 1.047 and came up with the moa for ea hashmark. They are: 1.5, 4.29, 7.2 and 10.5. Any trajectory chart that prints out a MOA reading can now be used to calibrate the scope to the gun. I'll try and see if quick target posts here......</p><p>Tabular trajectory data at Std.ICAO Atmosphere</p><p>-------------------------------------------------------------------------------------</p><p> Gun / Ammunition : 7mm</p><p> Bullet : .284, 154, Hornady SP 2830</p><p> Bullet weight : 154 grains or 9.98 Grams</p><p> Muzzle velocity : 3100 fps</p><p> Crosswind speed : 10 Mph </p><p> Ballistic Coefficient(s) (G1): </p><p> C1=0.433@V&gt;0 fps;</p><p></p><p></p><p> Optimum trajectory information : </p><p> Optimum sight-in range (X) = 205 Yds. </p><p> with max. ordinate above LOS at range (M)= 122 Yds.</p><p> and max. point blank range (P)= 238 Yds.</p><p>-------------------------------------------------------------------------------------</p><p> Sight-in clicks, 1 click = 0.992 cm/100 m or 0.391 in/100 m</p><p> Height of sight above bore axis = 3.81 cm or 1.50 inch</p><p> Gun is zeroed-in at 250 yds,</p><p> by sighting-in at level firing</p><p>-------------------------------------------------------------------------------------</p><p> Range Velo Time of Energy Path Deflection Total Sight correction Target</p><p> city flight to at crosswind drop for setting new lead</p><p> LOS of 10.0 Mph zero range 33 fps</p><p>-------------------------------------------------------------------------------------</p><p>·Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds ·</p><p>-------------------------------------------------------------------------------------</p><p>| 0 3100 0.0000 3286 -1.5 0.0 ----- 0.0 ------ ----- 0.00</p><p>| 20 3054 0.0195 3190 -0.4 0.0 0.09 0.1 +5.9 +2.01 0.21</p><p>| 40 3009 0.0392 3096 +0.5 0.1 0.19 0.3 -3.6 -1.22 0.43</p><p>| 60 2964 0.0592 3005 +1.3 0.2 0.31 0.7 -6.0 -2.05 0.65</p><p>| 80 2920 0.0795 2916 +1.9 0.4 0.44 1.2 -6.7 -2.28 0.87</p><p>| 100 2876 0.1002 2829 +2.4 0.6 0.58 1.9 -6.6 -2.26 1.10</p><p>| 120 2833 0.1213 2744 +2.6 0.9 0.73 2.8 -6.2 -2.11 1.33</p><p>| 140 2790 0.1428 2661 +2.7 1.3 0.87 3.8 -5.5 -1.88 1.56</p><p>M 142 2785 0.1449 2653 +2.7 1.3 0.89 3.9 -5.4 -1.86 1.58</p><p>| 160 2747 0.1645 2581 +2.7 1.7 1.02 5.0 -4.7 -1.60 1.80</p><p>| 180 2705 0.1867 2502 +2.4 2.2 1.17 6.4 -3.8 -1.29 2.04</p><p>| 200 2663 0.2091 2425 +2.0 2.7 1.31 8.0 -2.8 -0.95 2.29</p><p>| 220 2622 0.2319 2351 +1.3 3.3 1.45 9.8 -1.7 -0.58 2.54</p><p>| 240 2581 0.2550 2278 +0.5 4.0 1.59 11.8 -0.6 -0.20 2.79</p><p>X 250 2560 0.2666 2242 0.0 4.3 1.66 12.9 0.0 0.00 2.92</p><p>| 260 2540 0.2784 2206 -0.6 4.7 1.73 14.0 +0.6 +0.20 3.04</p><p>P 276 2508 0.2973 2151 -1.6 5.3 1.84 15.9 +1.6 +0.53 3.25</p><p>| 280 2500 0.3020 2137 -1.8 5.5 1.86 16.4 +1.8 +0.61 3.30</p><p>| 300 2460 0.3259 2069 -3.3 6.3 1.99 19.0 +3.0 +1.03 3.56</p><p>| 320 2420 0.3503 2003 -5.0 7.2 2.14 21.8 +4.3 +1.47 3.83</p><p>| 340 2381 0.3753 1939 -6.9 8.1 2.29 24.9 +5.7 +1.93 4.10</p><p>| 360 2342 0.4007 1876 -9.1 9.2 2.44 28.3 +7.1 +2.41 4.38</p><p>| 380 2304 0.4266 1815 -11.6 10.4 2.60 31.9 +8.5 +2.90 4.67</p><p>| 400 2266 0.4530 1756 -14.3 11.6 2.77 35.8 +10.0 +3.40 4.95</p><p>| 420 2228 0.4798 1698 -17.3 12.9 2.94 39.9 +11.5 +3.92 5.25</p><p>| 440 2191 0.5071 1641 -20.6 14.3 3.11 44.4 +13.1 +4.46 5.55</p><p>| 460 2154 0.5348 1586 -24.1 15.8 3.28 49.1 +14.7 +5.00 5.85</p><p>| 480 2117 0.5630 1533 -28.0 17.3 3.45 54.1 +16.3 +5.56 6.16</p><p>| 500 2081 0.5915 1480 -32.2 18.9 3.62 59.4 +18.0 +6.13 6.47</p><p>| 520 2045 0.6205 1429 -36.6 20.6 3.79 65.0 +19.7 +6.72 6.79</p><p>| 540 2009 0.6498 1380 -41.4 22.4 3.96 70.9 +21.4 +7.31 7.11</p><p>| 560 1974 0.6793 1332 -46.4 24.2 4.12 77.1 +23.2 +7.90 7.43</p><p>| 580 1938 0.7095 1285 -51.8 26.1 4.30 83.6 +25.0 +8.52 7.76</p><p>| 600 1904 0.7406 1239 -57.6 28.1 4.48 90.6 +26.9 +9.16 8.10</p><p>| 620 1869 0.7724 1195 -63.9 30.3 4.67 98.0 +28.8 +9.83 8.45</p><p>| 640 1836 0.8050 1152 -70.6 32.7 4.88 105.9 +30.9 +10.53 8.80</p><p>| 660 1803 0.8383 1111 -77.8 35.1 5.08 114.2 +33.0 +11.25 9.17</p><p>| 680 1770 0.8723 1071 -85.5 37.7 5.30 123.0 +35.2 +11.99 9.54</p><p>| 700 1738 0.9070 1033 -93.6 40.4 5.51 132.3 +37.4 +12.76 9.92</p><p>| 720 1706 0.9423 995 -102.2 43.2 5.73 142.0 +39.7 +13.54 10.30</p><p>| 725 1698 0.9512 986 -104.4 43.9 5.79 144.5 +40.3 +13.74 10.40</p><p>-------------------------------------------------------------------------------------</p><p>M = Peak vs. L.O.S, X = Set Zero, P = Max. Point Blank Range</p><p>Elevation above Angle of Site (0.0 deg.) = 0.0916 deg.</p><p></p><p></p><p>What you do now is go to the 2nd column from the right and match the closest number to the moa mark on the scope. Then you look to the left and see what yardage that mark corresponds to. I wish I knew how to make the numbers in color so they come out more plain but......this would be the estimate. 1st notch....320yds......2nd 430 yds, 3rd 535yds, and top of post 640yds.</p></blockquote><p></p>
[QUOTE="kraky, post: 127277, member: 180"] I contacted Burris and asked what MOA the extra crossmarks are set at. They acted like I was from Mars. So, I did a little research and found that 1 MOA= 1.047". I divided the inch correction at 100 yds by 1.047 and came up with the moa for ea hashmark. They are: 1.5, 4.29, 7.2 and 10.5. Any trajectory chart that prints out a MOA reading can now be used to calibrate the scope to the gun. I'll try and see if quick target posts here...... Tabular trajectory data at Std.ICAO Atmosphere ------------------------------------------------------------------------------------- Gun / Ammunition : 7mm Bullet : .284, 154, Hornady SP 2830 Bullet weight : 154 grains or 9.98 Grams Muzzle velocity : 3100 fps Crosswind speed : 10 Mph Ballistic Coefficient(s) (G1): C1=0.433@V>0 fps; Optimum trajectory information : Optimum sight-in range (X) = 205 Yds. with max. ordinate above LOS at range (M)= 122 Yds. and max. point blank range (P)= 238 Yds. ------------------------------------------------------------------------------------- Sight-in clicks, 1 click = 0.992 cm/100 m or 0.391 in/100 m Height of sight above bore axis = 3.81 cm or 1.50 inch Gun is zeroed-in at 250 yds, by sighting-in at level firing ------------------------------------------------------------------------------------- Range Velo Time of Energy Path Deflection Total Sight correction Target city flight to at crosswind drop for setting new lead LOS of 10.0 Mph zero range 33 fps ------------------------------------------------------------------------------------- ·Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds · ------------------------------------------------------------------------------------- | 0 3100 0.0000 3286 -1.5 0.0 ----- 0.0 ------ ----- 0.00 | 20 3054 0.0195 3190 -0.4 0.0 0.09 0.1 +5.9 +2.01 0.21 | 40 3009 0.0392 3096 +0.5 0.1 0.19 0.3 -3.6 -1.22 0.43 | 60 2964 0.0592 3005 +1.3 0.2 0.31 0.7 -6.0 -2.05 0.65 | 80 2920 0.0795 2916 +1.9 0.4 0.44 1.2 -6.7 -2.28 0.87 | 100 2876 0.1002 2829 +2.4 0.6 0.58 1.9 -6.6 -2.26 1.10 | 120 2833 0.1213 2744 +2.6 0.9 0.73 2.8 -6.2 -2.11 1.33 | 140 2790 0.1428 2661 +2.7 1.3 0.87 3.8 -5.5 -1.88 1.56 M 142 2785 0.1449 2653 +2.7 1.3 0.89 3.9 -5.4 -1.86 1.58 | 160 2747 0.1645 2581 +2.7 1.7 1.02 5.0 -4.7 -1.60 1.80 | 180 2705 0.1867 2502 +2.4 2.2 1.17 6.4 -3.8 -1.29 2.04 | 200 2663 0.2091 2425 +2.0 2.7 1.31 8.0 -2.8 -0.95 2.29 | 220 2622 0.2319 2351 +1.3 3.3 1.45 9.8 -1.7 -0.58 2.54 | 240 2581 0.2550 2278 +0.5 4.0 1.59 11.8 -0.6 -0.20 2.79 X 250 2560 0.2666 2242 0.0 4.3 1.66 12.9 0.0 0.00 2.92 | 260 2540 0.2784 2206 -0.6 4.7 1.73 14.0 +0.6 +0.20 3.04 P 276 2508 0.2973 2151 -1.6 5.3 1.84 15.9 +1.6 +0.53 3.25 | 280 2500 0.3020 2137 -1.8 5.5 1.86 16.4 +1.8 +0.61 3.30 | 300 2460 0.3259 2069 -3.3 6.3 1.99 19.0 +3.0 +1.03 3.56 | 320 2420 0.3503 2003 -5.0 7.2 2.14 21.8 +4.3 +1.47 3.83 | 340 2381 0.3753 1939 -6.9 8.1 2.29 24.9 +5.7 +1.93 4.10 | 360 2342 0.4007 1876 -9.1 9.2 2.44 28.3 +7.1 +2.41 4.38 | 380 2304 0.4266 1815 -11.6 10.4 2.60 31.9 +8.5 +2.90 4.67 | 400 2266 0.4530 1756 -14.3 11.6 2.77 35.8 +10.0 +3.40 4.95 | 420 2228 0.4798 1698 -17.3 12.9 2.94 39.9 +11.5 +3.92 5.25 | 440 2191 0.5071 1641 -20.6 14.3 3.11 44.4 +13.1 +4.46 5.55 | 460 2154 0.5348 1586 -24.1 15.8 3.28 49.1 +14.7 +5.00 5.85 | 480 2117 0.5630 1533 -28.0 17.3 3.45 54.1 +16.3 +5.56 6.16 | 500 2081 0.5915 1480 -32.2 18.9 3.62 59.4 +18.0 +6.13 6.47 | 520 2045 0.6205 1429 -36.6 20.6 3.79 65.0 +19.7 +6.72 6.79 | 540 2009 0.6498 1380 -41.4 22.4 3.96 70.9 +21.4 +7.31 7.11 | 560 1974 0.6793 1332 -46.4 24.2 4.12 77.1 +23.2 +7.90 7.43 | 580 1938 0.7095 1285 -51.8 26.1 4.30 83.6 +25.0 +8.52 7.76 | 600 1904 0.7406 1239 -57.6 28.1 4.48 90.6 +26.9 +9.16 8.10 | 620 1869 0.7724 1195 -63.9 30.3 4.67 98.0 +28.8 +9.83 8.45 | 640 1836 0.8050 1152 -70.6 32.7 4.88 105.9 +30.9 +10.53 8.80 | 660 1803 0.8383 1111 -77.8 35.1 5.08 114.2 +33.0 +11.25 9.17 | 680 1770 0.8723 1071 -85.5 37.7 5.30 123.0 +35.2 +11.99 9.54 | 700 1738 0.9070 1033 -93.6 40.4 5.51 132.3 +37.4 +12.76 9.92 | 720 1706 0.9423 995 -102.2 43.2 5.73 142.0 +39.7 +13.54 10.30 | 725 1698 0.9512 986 -104.4 43.9 5.79 144.5 +40.3 +13.74 10.40 ------------------------------------------------------------------------------------- M = Peak vs. L.O.S, X = Set Zero, P = Max. Point Blank Range Elevation above Angle of Site (0.0 deg.) = 0.0916 deg. What you do now is go to the 2nd column from the right and match the closest number to the moa mark on the scope. Then you look to the left and see what yardage that mark corresponds to. I wish I knew how to make the numbers in color so they come out more plain but......this would be the estimate. 1st notch....320yds......2nd 430 yds, 3rd 535yds, and top of post 640yds. [/QUOTE]
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Help with a scope? I think it is really a MOA question
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