Many gun makers back when you gun was manufactured made the chambers a bit shorter than the shell. They thought it would help seal the burning powder better with the fiber wads that were used. You'll find many 2 9/16 or 2 5/8 chambers meant for 2 3/4 shells. It's also why the forcing cones [ right in front of the chambers ] were shorter than todays with the plastic wads. The fiber wads were about 5/8" [ 1/2" cushion and 1/8" overpowder ] , so the shorter 5/8" forcing cones were used. Because I reload at about 7000psi, a low pressure load, I've never measured any of my guns chambers. All of them are Damascus except two, and I shoot clays three times a week year round. Bruce has said what Parkers were proofed for, so just shoot your gun and have fun.
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Paul Harm
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