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The current maximum average pressure permitted by SAAMI for 12g/2-3/4" loads is 11,500 psi. Anyone buying commercial 12-gauge shotgun ammo that's made for a wide range of guns to include semi-autos should expect them to be loaded to about that max pressure average. CIP (Euro) max average pressure is just a little lower.
Craig, the velocity shown for those 10g/1-5/8 oz/2-7/8" progressive powder loads is comparable with specs when they were introduced.
Threaded Mode