I have really good luck with 60grs. H4831SC using 130gr Interbonds. As for back up 55gr. of IMR4350 with 130's. I use either 58grs of H4831SC, or 58.4grs RL-22 with 140's. I'm currently working on 150's with the 270 win, i plan on using H4831SC since its has been really consistent and with great Sd #'s.