If your shots won' t be any longer than 250 yards and you plan to hunt nothing bigger than whitetails then I' d rule out all the magnums you mentioned. There' s nothing major wrong with them but the cartridges are more expensive , they have much greater recoil which makes recreational shooting less fun and at 250 yards or less they don' t outperform the others on your list by enough of a margin to really matter. Set a 308, 7mm-08 or a 30-06 about 1 inch high at 100 yards with a bullet in the 140 to150 gr range and you can aim at the center of the kill zone on a whitetail 250 yards away and the bullet won' t come close to dropping enough to matter. In my personal opinion I think the 7mm-08 may be the absolute perfect whitetail round. Very accurate, low recoil, relatively flat shooting, ammo is widely available and it drops whitetails like a lightening bolt.