I'm using the CCI 250 magnum rifle primers, dropped the hammer on it 3 times, if it wasn't seated the first time, it was the 2nd or 3rd time!! It looked as deeply seated as the rest, I check em after I prime with the Lee Auto-prime to make sure they are seated all the way. I left it chambered for a good 3 minutes before I removed it. It had a good pin strike on it.....just a dud, I think, just glad it wasn't on a trophy elk or a bear charge. :cry: :eek: