The .270 wcf is my main carry. I have an affinity to any 30/06 based round. I have not used the 6.5/06 or the .338/06 or the Whelen, but never say never.
The .270's in my house are all used and work well, the 30/06 I own because I believe it is a law or something, the 25/06, because I talked my Uncle into it in 1970. He later gave it to me- a model 700. Thing shoots bugholes even today.
If you are a sheep hunter, you owe it to yourself to try a lightweight .270 in honor of Jack.Cheers