Just for the record, I have only experienced one pierced primer in over 40 years of shooting. I built a .303 British Double rifle on a Noble shotgun action about 20 years ago. First one I ever did, regulated it and it shot surprisingly well. Almost scary good. I loaded all of my own rounds and was under maximum with IMR-4350 which shows comparatively low pressure to other powders in the round. Anyway, shooting it for fun one day felt an odd vibration in my right hand when pulled the trigger. When I looked, the right side of the pistol grip was blown off of the stock. Luckily it was one complete piece and I found it and glued it back on with little notice. This was the one and only DR I built on a shotgun action with dog tooth strikers. I have built some others since and never had a problem but now I only use actions with bushed firing pins. Been there, done that, seen it happen.