I was reloading the other day and I messed up one of the primers. No biggie. But when I got done I was looking at the screwed up primer and wondered...What would happen if I set it on the concrete floor and hit it with a hammer? I'll tell you what happens, but first things first. Make sure you don't live in "city limits." Fortunately, no one near by was home. But, boy that was a bigger bang than I thought it was going to be....KABOOM!! OH CR*P!!! I immediately said right afterwards. Nothing became of it, and I officially do not recommend doing that. However, if you do make sure you got safety goggles on and certainly do not do it within the city-limits of a town that had a shooting a few weeks before.