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Old May 28, 2013, 12:08 PM   #2
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 14,156
Your official group size is .4575, groups are measured nominally center to center of the two widest shots so caliber does not affect the quality.
But it is hard to locate the center of the hole so outside to outside minus one bullet diameter works.

If I am shooting far enough or with a gun of only moderate accuracy and not getting "one ragged hole" I just measure from the outside of one wide hole to the inside of the other. But an accurate enough rifle won't leave clear individual holes at 100 yards and maybe even more.
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