RE: .270
The answer is YES. It will handle deer Elk and Bear. Black Bear that is. Many have used it for Grizzly as well but its on the light side for that duty. It will do well on elk if you are a decent hunter and a decent shot. As with any caliber, shot placement is the most important factor BY FAR. Anyone who can put the 270 in the vitals of any North American Big game animal will be successful. It comes down to just that.
There is no better rifle for deer.