Could I fire the 500 magnum with a CCI BR2 rather than the typical rifle primers? Winchester large rifle primers are what I usually use, but I couldn't find any. I took a few BR2 and fired three rounds with them using a 440 grain bullet and 35 grains of little gun; they seemed to have a little bit more spice (maybe) than my usual priming load, but there were no signs of excessive pressure on the case or anything.