If you're reloading at a low pressure, the slight raise in pressure by shooting 2 3/4" shells in a gun chambered for 2 1/2 isn't enough to worry about - IMHO. Back when our Parkers were made it was thought that chambering the gun a 1/8" shorter would help with ballistics. If it means that much to you to shoot 2 1/2" shells I'd call Mec and see what they have to say. I shoot just American made old SxS's and at the pressures I reload at, never measure chambers.
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Paul Harm
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