i shoot mostly 69gr hornady match, and i liked aa2520 for years. but i'm running out and will not be buying more.
after western powders bought accurate arms, the buring rate consistency was not as consistent as it once was.
i've bought 8pds of w748 because of the improvements winchester has made to make w748 a cooler burning powder. so more people are returning to the powder that most closely resembles the ball powder winchester uses for the military.
tac from ramshot (western powders again) has a good reputation. i loaded it for a friend for his remy 700 and it preformed very well. meters like water. tac doesn't get the popularity because it's not carried as many places as other powders. but tac should definately be on anyone's short list if it is available locally.