Most of the quality U.S. manufacturers made their chambers 2 5/8" when the 2 3/4" shells were in use. It was to help seal the gases with the fiber wads in early use. The shotguns weren't modified or thrown out when plastic wads were brought out. I'd lay money that easily more than a million 2 3/4" shells are fired through these chambers in the U.S. each year with no problems related to length. If you're really concerned use a low recoil, low noise shell like the Winchester AA's or similar from other makers. Easy on the wood and the metal. Look at the vintage shotgun collector sites like the Parker Gun Collector Association, A.H Fox Collector, or L.C. Smith Gun Collectors sites. This question comes up often and it is dismissed as no problem by people that are the top experts on their brands.
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