For what its worth. The Elk and Mule deer are tough. I've tested 270, 270 WSM, 30 06, 300 mag, 7 mm. The one that is best with marginal shot placement is the 300 magm no question. I could tell the stories but if you shoot the 300 and can hit a 6 inch plate, it will be better. saying that the 270 is best for white tail 130 gr bullet, in the world. WSM 270 a little better. 30 06 is great cartridge, 300 mag better just faster and hydra shock, 7 mm overrated white tail gun, on mulies and 170 gr bullet expect 30% bullet retention, no good thick skinned game.. My story and have much experience Loco