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I've been doing some measurements on the big eight. The bore diameter at the choke, if there is a choke, is about .790". The outside diameter of the barrel at the muzzle is 1.070" The wall thickness at the muzzle is .140". Now I have to develop a system to measure the bore behind the choke. I think the easiest way to do that is to use a wall thickness gauge and some simple arithmetic.
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