I would use a slower powder than H335 only because when my gun got dirty it wouldn't cycle as reliably, not enough pressure. (Maybe my gun is just too crappy, lol) H4895 or CFE223 is what I normally use. With an adjustable gas block that may not matter, I don't have one. I would also use cheap 55 gr FMJs for competition too. I don't like spending .25 cents a bullet on targets I can spit on. I do load 69 gr SMKs for stages with long rifle shots.