Re: Powder/Primer shelf life????
My son-in-law does not reload and he collects military arms. He buys up surplus ammo of various ages from around the world. The oldest I have seen him shoot is WWII (1940's) Mauser ammo.
I read that the makers of Bullseye (one of the oldest smokeless powders still in production) keeps a jar of Bullseye from that period to compare to todays production. I think the Bullseye in the jar is nearly 100 years old (??).
But how it was stored is super important. Another factor is what is actually in the container? Did he make a mistake and drop in some other powder? I had a friend that did that by mistake. The key was that not all the grains of powder were the same shape and the color of them was different. Personally I would not use the powder but you can decide for yourself if you want to risk it, based on knowing your friend and his habits.
Also buy the latest manuals. Don't use old manuals as often the load data changes as the test instrumentation gets better over time and old loads turn out to be over or maybe even under loaded.