A 30 of some variety is usually the recommendation, with good reason. '06, 300WM, 300WBY, so on and so forth.

7s are usually in second place. Third goes to the 270, 338, etc.

I favor my 300 H&H. I can't recommend it due to ammo constraints and the fact that finding one ain't easy. I had mine built.

I would recommend a 30. The 30-06 is plenty good. The 300WM is the '06 plus 100-150 yards.

So long as you can run it, you'll be fine.