No discernible difference in performance on game between the four.

Pick the one that tickles your fancy based on a criterion important to you. Fastest? Go .270 Win. Least recoil? Go 6.5 Creedmoor. Most available factory ammo? Go .308 Win. Like .284 cal bullets? Go 7mm-08.

Any reason is fine, as these four check almost all the same boxes.

What could be a sadder way to end a life than to die having never hunted with great dogs, good friends and your family?