I think H4831 is generally considered "The .270 Powder". R-22, R-19, N160, N165, H4350, etc, etc.
280, No doubt they are the classics for the venerable round.But there are others up to the task.
I've been burning H4895 (on my 3rd 8lb jug) in one of my rifles.
IMR 4064 has been a top performer in the accuracy dept. in another.
