I bought a couple of 250 rd. bulk yellow boxes of the Remington UMC in 9mm. I must have gotten some bad boxes. In multiple guns, I got failure to feeds, failure to ejects, stovepipes, etc, in every mag or every other mag. It was also getting more black powder on my hands and gun than other brands that I have shot. I also tried during the same range session some Winchester White box and Blazer Brass, and the Bass Pro brand Winchester SZX? stuff, all without a hiccup. UMC was also getting little brass dust/shavings all over my guns, but not with any of the others. Maybe I just got a couple of bad boxes, but I think I will stay away from the UMC from now on. Anyone had bad experience with that stuff?