IMR4064 and Unique.
My third would probably be 2400.
I’m not trying to thread jack but it’s along the same line of question as the OP’s, how long can powder be stored before any noticeable degradation in performance?
If it was me, it would probably be Unique, 2400 and 4895, mainly because I know my dad used a lot of all three.
Unique - pistol, shotgunFor those of us that don’t know, what are each of the powders that you describe used for?
Unique - pistol, shotgun
2400 - magnum pistol, rifle (originally considered a rifle powder)
4895 - rifle
H4895 for everything up to .30-06, H4350 for anything bigger than the '06 and Win 231 for handguns even though the magnums will be reduced power loads.