I know .45 Colt has a smaller rim than I am used to in other calibers, but is there a brand/brands of brass that are a little larger/stronger than others. I was loading virgin Fiocchi brass with new RCBS dies and 2 cases stuck on the expander and pulled off the shell holder buggering the rim. I've had issues with virgin brass and new dies before, just forgot to polish the expander plug first, but I also had two cases pop out of shell holder while seating primers on RCBS bench primer. I guess another question would be is there a shell holder you've found to fit better than others?