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To get the mouth to flare, the expander had to go that deep...notice the part that creates the flare. I have contacted Cor-Bon about this as I feel the brass is the problem, since the bulge didn't happen on the regular longer 500 Magnum cases. the expander doesn't need to be that long, I may cut...

Thanks for the input...I started reloading in the 70's...don't make it a habit to reload for anyone but myself. I loaded 50 rounds for him...27 500Mag and 23 500 special...I hand weighed each charge...for safety's sake. The bulging happened during the expanding / bell mouth stage. The longer...

Loading some 500 special loads with RCBS 500 mag/500 special for a friend and having issues with Corbon 500 special cases. As I uses the expander die, it is making bulges in the case as it travels downward. Have to go fairly deep in the case to allow proper belled case mouth for bullet...