I shoot a lot of Damascus barreled guns and only shoot 2 1/2 inch shells either from RST or my own reloads using their hulls. I can't speak to the proper amount of wall thickness on a 12 as my guns are mostly small bores, What frame size is it?
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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