i have loaded 3000+ 45acp on my dillon 550 and i messed up maybe 2 rounds. both my fault when i first learned the set up.are you sure the brass has the same primer size? 45acp comes in large and small primer sizes!
All but one of the screw ups was me! Did have one small pocket case in there that i missed. The next time I ran it, i only messed up 3, and they all had primer system misfeeds.