Well getting a copy of the cartridge print off the net proved to be a test of wether or not this project would ever get off the ground.I emailed PTG and Ashleigh replied back that they didn't have this one in their files. So will fax the print over to them and see what's what. DD some years back had sent me a 303 case that had been fired in one of his 375 2 1/2" chambered martini's. Still sitting on my bench and thinking about the 37 rimmed. Frank