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Group size is conventionally measured from CENTER to CENTER of the farthest apart bullet holes. The reason is that measuring the distance from the outer edges would automatically increase the group size for larger calibers.
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which is why most people subscribe to
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No need to measure MOA, just measure in inches. A group size is measured as the farthest distance between the outer edges of the two farthest apart two holes, minus one bullet diameter.
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However, there is an easier way to measure "center to center". Take your measurement from the outside of hole A to the inside of whole B and your measurement will actually be "center to center" without performing subtraction of 1 hole.
