Subtitled: This is why we wear safety glasses.
In all the decades I have reloaded shotgun shells, I never had a primer go off while reloading.
Here awhile back I started reloading .38spl on a borrowed, Dillon 300. Just a simple load with LRN bullets and Bullseye. Granted I have not reloaded of late, still over the weekend I decided to to so.
I de-primed, went to primer and when I went down, the primer went off. Trust me, this will make your blood pressure increase a wee bit...
Best I can figure, while I was in out of the hospital, some "critter" got into the primer "cup". Not sure because whatever that hard thing was, it was not recognizable.
I keep a clean farmhouse, still while in and out, and back in again and out again of hospital, spider webs appeared, along with some other "bugs" and "critters".
Reloading area is in the large laundry room area if you will. Often times, since I do wear glasses, I will just slip on a pair of ANSI approved safety glasses , with side Shields that fit over my regular glasses. This day I was wearing one the pairs of safety glasses, ANSI approved to meet the regs of where I work. Including fixed side shields.
And this is why we wear safety glasses when we reload.
alone