Either will do the job just as well as the other, on the killing end.
I would ask myself why I'd want the additional recoil and blast of a magnum when the ranges are such that virtually any cartridge would do the job.
Recoil energy (ft/lbs) is about 70% higher and recoil velocity is about 30% higher with the Mag. All you get, shooting deer or hogs at 300 yards, is more recoil. The energy difference (about 600 ft/lbs at the muzzle) is unnecessary for the indicated conditions.
The mag uses a lot more powder too, if you're a reloader that adds up. (65gr versus 50, give or take).