I picked these up at an estate sale.  I am running low on my other powders.  I read up on these but still have questions.  I am loading .308 and .300 blk.  I have tons of brass and projectiles.  I want to use these powders up.  It looks like they want to push heavier bullets in these calibers.  Im looking for the best use of these powders in .308 and .300 BLK.  I read someone used one of them for 9mm.  Let me hear your opinions please.

Both are useful to you. H414 is close to H4350 and IMR4227 works for both super and sub 300 BLK.

H414 is the same as Win 760
Much akin how H110 and Win 296 are the same
and how HP38 and Win 231 are the same.