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I found that measuring the outside edges of the bullet holes typically gives a "Better" result than using the points on a dial caliper and measing the apparent center to center of the extreme spread (furthest apart). I prefer to measure center to center because for me, it is much more consistent.

Try measuring by extreme spread and then adjusting your dial calipers to the number calculated and seeing if it comes close to being accurate if you look at the holes center to center. I believe the reason for this is because the bullet holes (and black outlines) are typically smaller than the nominal size of the bullet.

Works well enough for me. YMMV.
- Ivan.
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