Thread: CCI primer misfires?

At the range today and I had 4 out of 16 rounds from the .338 LM misfire. Each just went 'click', left a healthy looking dent in the primer, but no boom. I tried cocking the rifle and firing again but none of them wanted to. I am using CCI large magnum rifle primers in virgin Lapua brass, reading online it looks like I may not be seating the primers deep enough, I seat them on a Redding press, and usually try to make sure they are seated as deep as they will go. I also try to spin each primed case 180 degrees and seat it again, just in case it wasn't seating them level. The dents look deep enough not to suggest a firing pin protrusion issue, but I can't be sure. I'd like to try other brands of primers, I can't find any Federal or Federal Match but I've heard they are good.
Any advice is appreciated, cheers, Tom