Apparently there is not a lot of experience with doing this since I've have 35 views and no response.
Ace Custom 45s says that the stock P90 is suitable for 45 Super "Tactical" loads(Speced at 185gr bullet 1200fps, 1125 fps 200 grain bullet 1025fps 230 gr bullet from 5" barrel) Those figures are just a bit higher than normal .45acp +p figures. Presumably pressures could fall somewhere between the 23k CUP ceiling of .45 ACP+p and the 29,000CUP ceiling of .45 Super but based upon Ace Custom's willingness to recommend the ".45 Super Tactical" loads for several guns with advice to contact the manufacturer about full .45 super loads I suspect that the "Tactical" rounds are right at the ceiling for .45ACP+p (Small ammo companies such as Buffalo Bore and Texas Ammunition seem to be able and willing to load closer to maximum pressures whereas large companies tend to set their velocity norms a bit lower and load whatever bulk lot of powder to the nominal velocity specs (+/-)while keeping pressures under the ceiling----Some current "+p" .38 special ammo from the big makers doesn't even match standard specs in performance nor , as far as I an determine based upon case measurements, does it produce higher than standard pressures) In no case should firing .45 Super catastrophically destroy a .45 ACP-current .45 Super pressures are UNDER .45 ACP proof pressures- but such rounds could beat a gun to an early death.
I don't need to push the envelope hard but I will come back to this thread and report on my +p load testing with .45 Super brass and a heavier recoil spring when I get a chance to pursue this.
