My go-to round for the .270 is 45 grains of RamShot Hunter pushing a Hornady 150 gr. spitzer. With a 130 gr. bullet, that same powder starting load ranges between 49.3 and 51.3 (49.3 for the Sierra SBT, 50.9 for the Barnes TSX, and 51.3 for the Hornady SST). By the way, I shoot a Weatherby Vanguard .270 which is really a Howa, which I believe is the same as the S&W.