Okay, so I loaded up 100 rounds of 24.3 grains of varget with CCI 450 primers, and went to the range. All 100 rounds fired without a hitch, I took apart the bcg, and the retaining pin wasn't bent, and there was no foreign debris inside. Also, my groups and velocities were better than with the cci 400 primers and 24.3 grains of varget! Thanks everyone for all your help, and take care!