re: Ammo reloading questions

Powder and primers should be good. Stored in ammo can should have kept them dry. Heat is another enemy. Where were they stored?

2 types of tumblers. wet and dry. I do wet with SS pins now. I think it is easier and cleans better. Look on YouTube and see which you would like.

As far as buying newer manual it is not a bad idea but I would just look at the power sites and get updated data for now.
Always verify data with published data from a manual or manufacturer's website.
Read the notes you found but verify all loads.

I personally like Lyman manuals for instructions but they are all good.
Be mindful of the safety protocols. Never start with max loads, guard against double charges, verify all data etc.....

Be safe and have fun!!