Ran into something interesting. During load development for my 7mm magnum, I’ve been struggling with finding a good load with 168 h-vld’s . My last barrel shot bugholes with them using 70gr of H1000 lit by CCI250’s. Tried H1000 and Retumbo lit by fed215’s and CCI250’s with not much love. I talked to my smith and he said to try BR2 primers. I’ve got a bunch of those for my 260, so hell, why not. Well, magic happened at 69grains of H1000 using BR2’s. I’ve found a couple claims on the internet of large rifle primers having issues at sub zero temps with ball powders (which H1000 is not). Has anyone here actually had a hang fire or failure in cold temps with non-magnum primers?