Richard I have a UMC Bridgeport,CT marked 10A brass shell. It measures .855 large end and .843 open end.2.615 long.
As a comparison I have a Draper patent two piece 10 gauge brass shell that is unmarked. It measures .848 large end and .838 open end. 2.378 long
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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