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Old February 29, 2012, 07:12 AM   #6
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 36,327
You can estimate the caliber fairly closely using simply a ruler and measuring the hole in the muzzle.

A .22 is going to be under 1/4 of an inch, a .32 will be close to 5/16ths of an inch, the .38 will be almost exactly 3/8ths of an inch, and the .41 will be about 13/32nds of an inch.
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