H-4350 has been suggested as a great powder for the 155-175 grain bullets. I don't have it and can't find it. Can find AA and IMR and if I worked up loads using them would I be in the "ballpark " as far as an accuracy choice? Are they close enough to each other that they're "accuracy equivalents"? I'd like to buy 8 pounders which is why I'm asking the question OR any other super choices??