By process of elimination, I don't believe the numbers are DAH, as guns of that period were almost always close to 3" and more. I also don't think it's loads, because they were usually 2 3/4 Dram Equivalent or greater.
I have to believe Dean is correct. I only have one 12 bore hammer gun, and it is a 1 frame, measuring 2 1/4" across the breach face. The column which shows, what I assume are gun weights, matches guns one would assume were heavier, i.e. 12 30" 12, 32" 10, 30 ", 10, 32". It would make sense that a 10 bore with 32" barrels, would be heavier, and logic would suggest they were on larger framed receivers.
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