Re the earlier comment about buying something that will take OTC shells, if you have a local source of Fiocchi ammo, they make a 12 ga training load that is well under 7,000psi, 7/8oz payload. If you can buy those shells locally, you can safely run them through an awful lot of old doubles. I also have in my files a copy of a letter from Sherman Bell regarding Win AA Featherlights in the 26 gram load. He ran P and V tests on them and came up with avg 5950psi.