What brand of primers are you using?, and are you seatings them firmly.
CCI. I primed them on the press, which I usually don't do - usually hand-prime. So I'm thinking that's likely the issue.
I did use a FCD.
I'm not going to do anything until I fire some more and I will pick out the ones that don't fire on the first strike and do some measuring and see how they are different than the others.
