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As in the title, essentially.
I'm assuming that it's less than .45.
My best guess is at a 9mm or a .38
Thoughts?

Lexicanum has a few things.

http://wh40k.lexicanum.com/wiki/Autoguns#.Uu7F4T93upo

Thanks. I feel really dumb now, considering that I didn't check Lexicanum first.