JGFLHunter:
I have been loading since 1993, and I have never had a missfire untill I used CCI #550 Magnum Primers on my sisters a Ruger SP100 .357 Mag. I am sure glad she was just practicing, and it was not a intruder. I have always used Federal. I had a box of CCI primers just sitting there, so I used them.

Good luck.