I am sure this could start a fight, but here goes. The man asked, which of the above 3 cartridges would you choose and why. Not, do you think the one that you shoot is better and why. For those of you that use less popular calibers and they work, good for you. But why would you choose less avaliable calibers when any of the above can be found in your local Crappy Tire store all across the country in more than 1 load offering. Too many times have I been hunting with a friend that brought a less than common caliber of rifle, say 6.5x55, screwed up and forgot their reloads at home and had to borrow a rifle or shotgun unfamilar to them, to save their hunt because he counldn't find ammo for it. For that reason alone if you stick with any of the above calibers, which should take any decent deer sized ungulate cleanly.
That is enough reason for me to choose the .270. More that enough to easily take a deer out to 300yrd (about as far as i can accurately shoot) ammo can be found or borrowed just about anywhere and if for some strange reason my gun were to break or malfunction there would be a better chance of the gun shop having parts to have it repaired quickly.
my 2 cents CDN1