I've used it in my 257 Roberts, but not much. I acquired 2 pounds of it some time ago and haven't used much until last weekend. I loaded up 9 rounds for my wife's 22-250 with the CCI 200 and a Winchester 55 gr. PSP. 35.5 grains looked really promising, but I started to see a little ejector mark on the case head. 36.0 grains saw it a little bit better, but the group was really good. I"ll load them up again and try them when the weather is cooler. It was 92 degrees last Sunday and that may have had something to do with it.
