I got 21 boxes of once fired FGMM brass from a guy here in NorCal. He has no place to reload so he gives his brass away after our monthly matches. I don't have any reason to doubt him when he said it is all FGMM. When I started to tumble the brass prior to sizing, I found that of the 21 boxes there were 5-6 where the brass was a different color. Same headstamp and caliber, but the brass looked like it was made from nickel, not brass. Any idea why this is so? Also, would the nickel be safe to load or should I just put it away. Thanks in advance.
