I just purchased a shotgun with 2 1/2 inch chambers. At present I load a recipe that is 6000 psi in a 2 3/4 inch hull from the 16 gauge society. Do I recall correctly that it would be OK to shoot the longer hull in the shorter chamber if the pressures are low. Thank you.
According to testing done and published in the DGJ several decades ago, shooting a 2 3/4" shell from a 2 1/2" chamber, IN A 12 GAUGE, raises the pressure max in the 600 to 800 pssi range. As you go to smaller gauges, the increase in pressure gets bigger. But for a 16 gauge, you can think in terms of 1000 psi.
So a 6000 psi load becomes a 7000 psi load. Both levels safe for guns we generally think of as requiring low pressure loads. Assuming barrel wall thicknesses are appropriate.
