I was sorting through some range brass today after wet tumbling it and I noticed an odd looking 9mm “brass” case. It looked a bit odd so I swept it with a magnet and it turned out to be brass plated steel case. It was slightly copper colored and that is what stood out visually. Then I swepped the entire pile and found about 10 more out of roughly 500 9mm cases that were steel. They looked JUST like brass cases but as the magnet revealed they were only brass plated steel cases. These were NOT copper colored but yellow brass and looked identical to the other cases. If I wouldn’t have swepped all of them with a magnet I would not have caught them. Therefore, I’ve added a new step to my range brass inspection.
BTW, the two head stamps on those 9mm cases were FM and X-treme ST.