As long as it's been stored properly it should be fine, I've shot ammo from the 20s without incident. The primer in rimfire ammo tends to degrade more than in a centerfire, but even then the most unsafe thing that would happen would be a hangfire, mostly you'd just get duds. Be aware of the possibility of a hangfire and react accordingly and you'll be fine.
That said, if you are going to clean it up, don't use a tumbler. It seems obvious, but working at Cabela's you'd be amazed at the questions I get.
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