MANY years ago i came by a cardboard box of .223 "fired" blanks. I was using a bench grinder to grind off the crimped end, then i trimmed the caseings to length, and reloaded them. They worked just fine. In fact, i was shooting a .222 - 12 ga combo gun a lot those days, that i was loading in bullets i swaged out of empty 22lr caseings. I turned a lot of those blanks into .222's, to be loaded with those home swaged bullets.
I was doing so many of them, it became mechanical! Grab one from the box, grind the end off, and throw it into another box!! I'd do them until i couldn't stand it any more, then take what i had done to the trimmer...
Anyway, durning one of those "mechanical moments", i grabbed one, started grinding it, and it WENT OFF in my fingers!!! NO glove or anything! Damn!! It hurt like hell, and my fingers "buzzed" and my "ears rang" for hours after, but there was no permanent damage... lol
DM