I use Wolf LPM in my .44 Mag. and they all go bang in my Puma, DW H44, Rugher SBH. Only shot a couple hundred so far. I also use their SPM for my .357, but haven't shot any yet. I've noticed that they are a little harder to seat than the CCI primers I had used previously. I haven't gotten around to measuring them yet so I don't know if the extra pressure needed to seat them is because of the diameter or the alloy of the cup, or ? Perhaps it's from the bare cups, not nickle plated.