The .270 wcf is my favorite chambering. I hunt sheep first, everything else second, it is more than you need for any ram and I have killed Bull elk and moose with it over 40 + years.
These days a guys sends the 150's at 3000 fps + with Reloder 26 out of a 22" barrel.
A guy with a .270 wcf or a .280 rem doesn't need much else around here. The 30/06 works pretty well too.
If I were going to go 6.5...it would be and /06 style, but there is no need. I am an unabashed .270 guy....just the way it is. It will go with me in the morning.Cheers.