Not sure where this should be posted so here it is in Our Town since we don't have a reloading category other than reloading equipment.
This happened 2-3 years ago and was an isolated incident. I reloaded my first cartridges in 1978 and this incident was a first. I just wanted to share. I was up on a stool changing the casefeed plate on my Dillon 650. I saw a smooth, shiny object in the bowl of the case feeder and my first thought was that I didn't remember any rivets in there. A friend was there with me and I told him what I found and shat I was doing. I picked up some hemostats, thank goodness, to try to figure out what it was. It looked like a smooth shiny rivet head. As soon as the hemostats made contact, no pressure at all, it exploded. Nope, not a rivet! After pausing a moment to regroup, I picked it off of the plastic and it was clearly a primer that had been mashed to the point that it looked nothing like a primer. My guess was that it was pre-sensitized by being completely reshaped. Maybe a static discharge set it off. No idea how it got in there outside of a case. I can only speculate that it got in the case feeder in a cartridge that had a loose pocket and came out while tumbling in the case feeder. How it got mashed to the point it no longer looked like a primer without exploding baffles me. I was fortunate that I had on eye protection and didn't touch it with a bare finger.
Not much else to say about this other than if you see anything that looks out of place or out of the ordinary in your reloading area be very cautious.
David