My heaviest bbl'd gun is an 1883 twist bbl 0-grade 12ga hammer gun with 32" bbls. I feel safe shooting just about anything within reason through it, that being any factory 2-3/4" 12ga shell of 1-1/4oz or less. I've shot quite a few old 3-3/4dram 1-1/4oz loads through it with no issues, and I do check it after every session with those shells.
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