RL-19. Good luck.

I usually use I4350 in most of what I load. Tried H4831sc in the 06 with 150 gr Interlok's, Gamekings and Corlokts. All three bullets shot inside 1.5" with the Corlokt producing the best groups of just under and inch. I also get excellent accuracy with 140 gr SST's and Accubonds out of my 270 WSM with 4831SC.

I use IRM 4064 with 130 Nos. BT's. I also use this powder for reloading 2 buds shells both with 130 Nos. Part. and we all get real good accuracy.