I dont know why you need a magnum,Im a big fan of the 6.5mm-06 and the 338-06 and my guess is at what ever practical range you can hit it in the vitals you can take the animal with either of these rounds,seems like the world has gone magnum-mania nuts,guys are huntin today with guns big enuff to be anti aircraft when heavy bullets at modest velocities and good shot placement is what it takes to put game on the ground.................