I have not seen any real performance problem shooting Bismuth at ducks out of my 10 bores, usually 1 1/4 ounce of the old Bismuth Cartridge Company 4's which are really size #3. Fed hull, 32gr of 7625, velocity 1155. When velocity is lower increase the mass of the pellet. Almost all the Sherman Bell Bismuth loads in the short ten are 1100 to 1200 fps + or -, they work.
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