Chuck, I hope I word this correctly.....the bore diameter of the older 10B gun is the same as (or close to) later guns. Brass shells were thinner than paper shells, so paper and plastic hulls are tight in the chambers of 'B' guns. Later on, the 10A brass shell was made the same outside diameter as the paper hull, so brass could be interchanged with paper, and our modern plastic, shells.
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GMC(SW)-USN, Retired
'Earnest Will'
'Desert Shield'
'Desert Storm'
'Southern Watch'
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Hybrid Mode