Tom I really don't know if the other powders make much difference at all. I gave up on 17's for a while because of the inconsistency of the the available bullets. Hornady 25 grain HP's performance on PD"S and jacks. And the fact that I got tired of the cleaning routine I had to do.
The accuracy and consistent performance of the V-MAX and finding real nice Cooper model 21 for a price I could afford brought me back into the game.
I don't keep track of round count on barrels and simply replace them when they won't shoot as well as I'd like them to.
TAC and 748 are cleaner burning than 4064 in my experience in 17 Remington's and allow longer between cleaning.
Long drawn out way of saying I don't know. Sorry
