I just grabbed some loaded paper 20-gauge shells out of my accumulation. A roll-crimped Peters 2 1/2 inch shell is 2 9/32 inch long. A roll-crimped Remington 2 3/4 inch shell is 2 15/32 inch long. A Super-Seal Western Super-X 2 3/4 inch shell is 2 11/32 inch long. All would easily go into a 2 1/2 inch chamber.
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