Ive had several problems over the years with Remington primers failing to fire or hang fires in extremely cold weather,in my 375 H&H and 378 wby, never an issue with federal or Winchester so I just don,t use Remington any longer, I think part of the problem might be related to thicker and stiffer primer cup metal in the Remington because the indents don,t look as deep in the fired cases as they do with the fed,Winchester or CCI primers.
it was easy to tell because the GOLD color Remington vs the silver federal primers, I usually load up 120 cartridges for a hunting trip, just in case, but seldom use more than a couple to verify zero and one or two to kill game. one year I loaded about 200 because both my sons carry 340 wbys, and I loaded 40 with remingtons. both my older son and I had hang fires, both with the gold primers

Last edited by 340mag; 12/28/12.