What and where are you going to be hunting?

I love the .270 Win. caliber as a whitetail deer gun. It is plenty big enough to knock 'em down. It's real advantage over the 30-06 is the flatness of its trajectory. Accordingly, I don't see much advantage of the .270 Win. in a semi-auto. If you are going to shoot that round, I would want to shoot it out of a bolt-action and mazimize its accuracy.
-MG