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In the 1970's I was shooting US military surplus ammo dated 1918 in my Garand. Right now I have 7.62X54R for my Mosin Nagants that is Bulgarian made in 1954. I also am shooting 1950's Korean M2 Ball in my Garand and Springfield. I have 1976 Chinese 7.62X39 that works just fine.
None of this was vacuum sealed, in fact some of it has not even been stored in ammo cans.
I keep my ammo out in my barn due to the amount on hand, and it regularly gets up to 110 F in there in the summer.
This past year I did bring home a non-working refrigerator to put in the barn as a large ammo can. This will give some protection against high heat, but really, most modern powder can handle high temps. I have shot 357 magnum that was in my truck gun that had been inside the truck for well over a year. And summer in Florida will get vehicle interior temps to 140F and above.
None of this was vacuum sealed, in fact some of it has not even been stored in ammo cans.
I keep my ammo out in my barn due to the amount on hand, and it regularly gets up to 110 F in there in the summer.
This past year I did bring home a non-working refrigerator to put in the barn as a large ammo can. This will give some protection against high heat, but really, most modern powder can handle high temps. I have shot 357 magnum that was in my truck gun that had been inside the truck for well over a year. And summer in Florida will get vehicle interior temps to 140F and above.
