Originally Posted by William_E_Tibbe
Originally Posted by mathman
Originally Posted by teal
I just think it's easier to find outside edges than to "guesstimate" the center of the bullet hole when measuring groups.

Particularly as people tend to report groups to 3 decimal places.


Yeah, and for a lot of purposes it's really moot.

That said, I just did a test. I have a target on my desk with two groups shot by a 7mm rifle. The bullet marks are well defined.

First I measured directly center to center as carefully as I could. Then I measured outside and subtracted a bullet diameter. This second measurement produced a smaller number.

Then I measured the diameter of the bullet hole marks. They were .25" to .26". Call it .03 under bullet diameter.

Care to guess what the difference in the group size measurements was?


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No, I try to avoid guessing.

But tell us !


Using the word "guess" is sort of the pun there, wizard. The answer was already given. laugh

Sometimes, the air you 'let in'matters less than the air you 'let out'.