I have an old Russian Mosin bolt action and have fired ammo made by various former Warsaw Pact countries during the 50s, all went bang! I've also fired 5.56mm ammo made in Guatemala from the 80s in which the entire cardboard box had been eaten away by some termite/bug leaving the cartridge to sit in insect excrement. They also went bang when fired. I carried .50 cal ammo on my tanks and trucks in OIF I,III that was last inspected in 1950! Never had a hiccup. My point is that the age of the ammo shouldn't be suspect. Ammunition stored at marginal levels are likely to outlast most human beings. Especially the old commie ammo with the corrosive primer. Of course dented, corroded ammo should be suspect.

Now of course I've heard from some that the Bulgarian brass 7.62 x54 casings could split when fired, but this is only what I have heard.