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Look at the Belgian proof marks. If you do not see kind of an elongated omega around "16-70" indicating a 2.75" chamber, the default is a 65mm = 2 9/16" chamber. Probably the case for a pre WWII gun.
Ream the chamber without enlarging the ejection port?
Sure, like the lawyer dramas on TV, it is (distantly) POSSIBLE, but is it likely?
The complete conversion used to be a fairly standard job, but I cannot now find it at Briley or Simmons, or even Browning. I bet somebody still remembers how to do it.
Or you can pay a little more for 2.5" shells and move along.
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