CCI NO 34 PRIMERS OPTIONS

I am pondering the slam fires were from persons making use of benchrest primers which seem to be form of touchy.I've used them during the WSM's, although not the standard mags or the H&H length mags. I am guessing that they might be Alright during the mags If you're employing a a lot quicker powder ie: 4198 during the 458 Win mag...This is certainl