Richard the bores are cylinder on both sides. No choke . That said the bores have a lot of roughness, not pitting so much inside. If they were honed they were done many years ago, I would guess. The barrels are plenty thick. A 10 gauge shell will not even start in, a 12 gauge shell will, but is loose. I should not admit it but I have shot 12 gauge shells in it just a few times to test fire. I just wrapped about 3 or 4 wraps around the base of smoe RST shell. What would be the chamber size of a 10B shell?
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