The hotter military primers are intended to ensure positive ignition in extreme temperatures.
Really cold weather can effect powder ignition and burn.
If I was going to use the ammo in the winter here in Michigan, I would definately use them.
I normally use Remington 7 1/2s.
Are Remington Primers too soft for military rifles? I have used them in the past with good reults. Some say CCI primers are the way to go with .308 in an M1A. Opinions?
CCI uses the hardest primer cups of all the US manufacturers.
Many high-power shooters use the Rem 7 1/2 benchrest primers in their ARs with no problem.
I use the CCI #34s in my .308 ammo that will be fired in my M1A, but I have also shot quite a bit of Federal Gold Medal Match thru that rifle and Federal primers are said to be the softest. Go figure.