Thread: Bad Primers?

So today I was at the range sighting in my 6.5 Creedmoor and there was an older fella at the range before I got there, had a bit of a yarn with him and then got to shooting. Anyway not long into it he gets a misfire, that's odd but I guess you do get them now and then right? then after another few shots he gets another...OK now that's weird, something is obviously wrong with 2 misfires in that many bullets. Hes happy enough to continue shooting them and then this happens. Looks to me like the primer has failed as there is a small crack and a tiny hole where gas has escaped out the back. I had a look at the other cases and couldn't see any pressure signs. He had 4 misfires by the time I left the range. Anyone know what could cause this? He said they were Winchester primers.