I wish I had taken care of this a couple of months ago cause I am in a loading frenzy right now, working up a load for the new AR I just took delivery of. It doesn't do it at all when I load .243, I guess cause of the larger surface area of the .243 primer, just does it on .223. I'm using Winchester and Remington small rifle primers, does it on both. Wish I could find some CCI. Still cant make up my mind which tool to try. See miner gripes on all of them. Wish I still had my old original RCBS hand primer. It was perfect. Gonna be interesting to see what RCBS does when I send this one back in.