I met a reloader/shooter at Dr. Kenneth Knotts gun smith shop in Castor, Louisiana not long ago. His brother had blown up a rifle. They dismantled the rest of that batch of hand loads and found that someone (probably a kid) had come along and dropped primers in the already primed brass sometime between the priming and the powder addition. So much for leaving your half finished loads unattended. Here's hoping it wasn't a saboteur. I've never thought to try an extra primer.
