Mr. Sauers:
Most English guns made prior to WWII had 2 1/2" chambers. And some with 2 5/8. Either chamber length will handle modern pie-crimped 2 3/4" cartridges with no issues. I've personally fired many thousands of 2 3/4" cartridges in my own 2 1/2" English guns with NO problems at all. However, these are modest 7/8 or 1 oz. loads. NOT Walmart promo shells.
If you need further assurances, know that Sherman Bell tested this and found only a 50 psi increase in the longer hulls.
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