I've explained how I can sorely test 'fool proof' procedures. I use a SS and last session I found a few .380 cases not marked as such mixed in with my 9mm. Not real dangerous in itself, but I was surprised how they got through resizing, decapping and expanding, only to be found in a the priming operation. STILL, one got through and when I was plunk testing them, one slid down into the chamber instead of having the rim exposed. To my greater credit I didn't see this as a problem right away until my brain started working and said, "That ain't right!" Man.....THINK.