Tumble it clean, deprime it, swage the primer crimp. and go to it. Nothing wrong with that brass. I load brass from WWII all the time that other guys don't want and toss. I'll take it any day. After loading it about 5 times it's necessary to anneal the necks, but the first few times, it's good to go.
As long as you're not going to use it for competitive shooting, the mixed dates aren't a concern. Any differences in case weight and volume will be very minimal.
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