Originally Posted By: Rocketman
Always keep in mind that SAAMI (USA) loads allow higher pressure than do CIP (Europe). The taboo of 2 3/4" shells in a 2 1/2" chamber has, or at least should have, more to do with the higher allowed SAAMI pressures than with the hull length difference.

DDA


There's the long shell/short chamber wisdom, in a nutshell. Per Bell's tests, reported in DGJ, a longer shell in a shorter chamber will result in SOME increase in pressure, usually several hundred psi--some of which can be offset if the forcing cone is lengthened. But the major issue is not the length of the fired shell.