longdayjake
Member
My guess? Glock bulge not getting completely ironed out. This is a common issue guys have with using range brass. SOMETIMES, but not all the time, you can eliminate it by "cam over" on your press. Thats when you screw the die until it touches the shell plate and then give it an additional quarter turn. This works on single stage presses but progressives can be damaged by it so be careful. The other option is to get a roll sizer. The slow option that some guys have resorted to is to run all your sized cases through a bulge buster die before loading.