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Ah, it sounds like a very good theory. I have a Parker 10ga with 2 5/8 chambers. It has about a .020 "step", so for that reason I cut shells. If it had the regular forcing cone I'd just shoot the longer shells. As to shooting shorter shells in longer chambers you'd get some blow-by and pressure loss. I've read that chambers of old were shorter so the cushion wad would still have some in the shell as the front was at the end of the forcing cone; thus giving a good seal. Paul
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