When it comes to old powder, as long as the powder has the acetone smell it is still good powder.
If you open the container and a rust colored dust is seen it’s bad powder.
I started reloading in the early 60’’s . We bought surplus IMR 4831 in 8 lb kegs from WW II era, never had a problem. As a matter of fact it was just before the panic that I used iall I had up.
Stored properly powder lasts a long time.
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