Pressure Testing brass shotshells: I discussed this with the owner of Big Bore Ballistics. He has to use a special drill technique near the head of the shell to drill a hole into the brass in order to drive a piston in his pressure testing apparatus. Not so with plastic hulls. Tom Armbrust refers TSS testing to him. Precision won't test brass shells. Just a heads up if you should want to test once you establish satisfactory velocity. Gil