I had something unusual happen recently. I was sorting and depriming some recent finds and I had the depriming pin punch through several of the primers. This was nice clean looking brass. I've had this happen with corroded looking stuff before but not with anything that looked this good. This was Winchester 380 brass and the same Lee universal depriming die that I always use.

It makes me glad that I deprime and tumble my brass before I mail it off in a trade.