HOME DEFENSE DECISIONS

Calculating the physical equivalent group size equal to one minute of arc can be done using the equation: equivalent group size = tan(MOA⁄60) × distance. In the example previously given and substituting 3,600 inches for 100 yards, 3,600 tan(1 MOA⁄60) inches = 1.047 inches. In metric units 1 MOA at 100 meters = 2.908 centimeters. ................
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