Chamber length at that time could have been either 2 9/16" or 2 5/8" - I've seen both in 12 gauge guns of that period. I have a DH made in 1898 with 2 9/16" chambers that I have shot a lot of 2 3/4" shells with. It beat up my shoulder pretty good so now I shoot RST 2 1/2" Lites and all is well.
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