All my elk hunting is in grizzly country. Unless you get a CNC shot, whatever you're shooting short of a 375 H&H is not likely to anchor/stop a charging bear. I'm not going to base my rifle choice out of fear, and a good case can be made for having 5 rounds down in a standard rifle than the typical 3 down of a magnum. Also, the lesser muzzle flip of a lighter round like the 270 makes for faster follow-up.
Besides, if the thinking is that a 150 Partition from a 270 won't kill our middling sized grizzles, there's a certain bridge over the Hudson River that should be considered for acquisition