Mr. Graham:
If fooling with 2 1/2" shells makes you happy, fine. However, I've fired many thousands of reloaded 2 3/4" cartridges with 3/4 oz. of shot in all my 2 1/2" guns with no ill effects whatsoever. On average, pressures only increase about 50 psi or less. But don't take my word for it. Sherman Bell tested it all for Double Gun Journal years ago and found that it's not worth the worry.
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