Lord that's an old cartridge brought back from the dead zone. If I recall correctly, if you are having a hard time finding cases, you may have an easier time locating .350mag cases and necking those down. I'd have to track down some of my old reloading books to be sure but I am thinking that 6.5RM was based off that 350M cartridge case. Correct me if I am wrong on that one RR as I am tired and old