Re: Large Rifle/ LG Magnum Primers?
I have hunted with both Magnum primers, and non-magnum primers in a 300 Winchester Magnum and Reloader22 in temps below -30c (-22f) without problems. I've always used what ever primer gave the best groups for the load I was using. Now if I was using 70+ grains of a ball powder in that cold of weather I might want to go with a magnum primer..
With Reloader22 I lose about 150 FPS from +20 to -20c (68f to - 22f) and adjust my loads accordingly. I'm thinking of trying a less temp sensitive powder next year but don't want to leave R22 as it's always given me great accuracy, and velocity in various calibers.