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2. What is the significance of " 1/31 " on the barrel flats?


Mike, I think he meant 13/1, which would indicate a bore diameter 9" ahead of the breech end of .725 to .728.


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If you mean chamber length I believe the 12 over C in a diamond indicates 2-1/2" chambers. Over the 100 and some odd years they ahe been proofing guns the rules have changed from time to time. If you could post pictures of the barrel flats it would be very helpful


12 over a C in a diamond means 12 gauge chambers, nothing more. If a gun was proofed at 1 1/8 oz it originally had 2 1/2" chambers; if the proof load was 1 1/4 oz it was 2 3/4".

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