Ideally, the rear gage should be .006" - .008" when measured with empty casings inserted. There is some variation in case rim thickness among manufacturers, and obviously, this will have an effect. Most of the rims on the casings I have here measure .054"-055".
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 02-03-2017 at 08:40 PM.
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