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Don't remember the date but the military dropped mercuric primers well before 1942. Don't think the military used double base powders for small arms in WWII.
I'm still using surplus GI cases with '42, '43 and '44 dates but I had no problems in my 1903-A3 in 63-'65. Of course the powder was much younger then - so was I. Given the age of the ammo, I suspect I'd also pull the bullets, dump the powder and reload 'em with new 4895.
Given the crimped primers, you're likely to have some caps popping when you remove them but they aren't dynamite, just wear safety goggles and don't let piles of live ones accumulate in the primer catcher.
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