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**Mike Irwin** · February 29, 2012, 08:12 AM

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.

February 29, 2012, 08:12 AM	#6
Mike Irwin Staff Join Date: April 14, 2000 Location: Northern Virginia Posts: 33,097	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. __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.