I have shot some 50 year old stuff. As long as it's factory and non corrosive.
I was given my uncles circa 1960 300 Wby mag with 10 boxes of ammo. Interestingly marked at $8.00 per box of 20. Turned out to be reloads by who knows, so I took them to the LGS for disposal. Didn't want to fire even one.

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"from my cold dead hands" C.H.