Years ago, I had a primer go off, a 210M in a swaged military .308 case, I left it in the ceiling above my reloading bench as a conversation piece. As I remember, the bullets were seated tight, my Dad's old Herters die, I was whacking it fairly hard against the top of my reloading press to dislodge the bullets as I had done many times before, then BANG, the primer went straight up and stuck in the drywall of the ceiling. I'm certain that there was more than .002" neck tension, and since that day I tap lightly, using just enough force to unseat the bullet with about six impacts. I was amazed the the powder didn't ignite. But, I'm pretty sure some pee came out. ;D