I think that if I were going to be using that on deer, I would take a serious look at the Hornady LeveRevolution ammo as a factory option. It is supposed to give good expansion at low and high velocities as well as shoot fairly flat due to a higher BC.
Georgia Arms has a .357 158gr Gold Dot load that is specifically made for whitetail deer they call their "deer stopper." The muzzle velocity is 1475 ft/s from a 6 inch barrel.
Georgia Arms - .357 MAG