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Old December 14, 2012, 08:32 PM   #15
m&p45acp10+1
Senior Member
 
Join Date: May 3, 2009
Location: Central Texas
Posts: 3,307
I have a friend that works down the street a machine shop. They have great measuring tools there. He will mic a few for me. As well as a pure lead round ball that I used to slug the barrel with today. I checked the caliper against 10 Laser Cast 350 grain sized at .459 all of those were .459 on my caliper.

Oh and for the micro grove rifling. I am looking down the barrel, and the rifling does not look shallow at all. It is deeper than most of my hand guns, and several of my good shooting rifles.
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