I'm having trouble finding what I need to make a powder measure work on a press, for charging RUM cartridges. What I can't seem to find, is a charging die (along with internal drop tubes) that will handle anything larger than .308 cases (.520"). This is my first foray into loading such large cases, and this is a problem that I was not expecting to have. I'm thinking that it shouldn't matter what brand of powder measure is used, as they should all be compatible, right? The problem seems to be with fitting the powder measure to the press. It obviously requires a die which RUM cases will fit into. But for some reason unknown to me, I seem to be coming up dry on that sort of die. Can anybody point me in the right direction, on where to find what I need?