living and hunting in northern Minnesota with my rifles staying in a cold truck or in a cold pole shed and up here we have dang cold weather lots of below zero weather . I have had much better results always with large rifle primers and to be honest Federal seems to make a better cold weather primer too. I have even left my AR-10/243 built by Norene Firearms out on my shooting bench for 2 days, it stayed below 20 below on both nights, third day tested rifle with 3 shots at 300 yards, the group was at 1 1/2 inches- 1st shot was 1 1/2 from the other 2 shots, those were about a 1 inch with one inside the 3 shot group, this off a bench with bench bags and there was no wind that day.
