You are on the right track. I happen to use IMR 4350 in my 30-06, but the Hodgdon version is pretty close. I shoot 59 grains of IMR 4350 in my rifle behind the 150 grain Tipped TSX for 3000 fps. I have not managed a 1/2 inch goup with this load as of yet, but have gotten darned close. Starting around 56 or 57 grains is probably a good idea.