I've had great success with both H335 and Ramshot TAC with bullets up to 64 gr. I need to pick up some 8208XBR myself, as I will soon be loading 6.5 Grendel and it's supposed to be a great one for that caliber as well.
I just loaded my first rounds for 65G. I'm starting with ar comp. Now I just need time and a place to try them out.