i know one thing for sure the old paper wad in a 2 1/2 inch 410 shell will pattern in a 3 inch chambered gun as it will in a 2 1/2 inch chchambered 410... just as a 2 3/4 inch 12shell will patern the same in a 3 1/2 inch gun as well as it will in a 2 3/4 inch chambered gun..with paper wads....charlie
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