I have nothing against anyone who likes to shoot a Magnum rifle as long as they stay off of my six about not using one.
I would be happy to use a 270,280,308, 30-06 or 45-70 for all Lower 48 big game. You can add The 44 Mag revolver, 35 Remington Contender and 50 Cal Muzzle loader to the list as well. I know all of these work. I have used them all for lower 48 big game. I have also used the 7MM and 300. Mags.