Thread: Range report.
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Old January 19, 2019, 08:22 PM   #10
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Join Date: March 13, 2005
Location: Pennsylvania
Posts: 845
I'm interested in how you calculated the MOA. If the group diameter was 1.311, you subtract the bullet diameter, .277 and the group is 1.034.

With 5 shots measuring 2.025, subtract .277 = 1.748.

Your calcs were a group of 1.311 = .626, yet a group 154% larger, 2.025 gives a MOA only103% larger, .644


As well, your photo show a circle drawn a great distance away from the outside diameter of the group. The circle drawn should be just at the outside of the two or three bullets holes that are furthest apart. That is the group size, then subtract the bullet caliber diameter.

For example, draw 2 one-inch circles touching each other. Each circle represents a bullet diameter of one inch. When they touch each other the overall diameter of that "group" is 2 inches. If you measure the distance from the center of one to the center of the other, it will bea MOA of one inch. You get the same result by subtracting the bullet diameter (one inch) from the group diameter (2 inches).

The goal of MOA shooting is to have both bullets exactly covering each other so the center-to center distance is zero. If the overall group measurement of my example is 1.5 inches, that group is 0.5 MOA.

Last edited by cdoc42; January 19, 2019 at 08:35 PM.
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