I too would say it is not a good practice to shoot 2-3/4" shells in chambers that are actually 2-1/2" long. 1/4" difference is a bit more than I would be comfortable with.
My initial question about the chamber length was if they actually measured 2-1/2" or if they measured 2-5/8".
There is a lot of Parker documentation (literature and hang tags) that tell us that Parker guns with 2-5/8" chambers were designed for shooting 2-3/4" shells.
The 1/8" difference was designed to make a better gas seal and allow the gun to hit harder.
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B. Dudley
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