Clays works well for making wimpy loads(I've loaded many with this powder), but if you are looking for one powder to cover all those calibers, I'd look elsewhere. Same goes for Bullseye, too fast for 44 Mag, so you'll just be able to make wussy loads there.
They've been mentioned already, but good all around powders are Universal, Unique(although I use it less and less the more I play with newer powders), Win231(or Hodgedon HP-38, same stuff).
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