Confidence in your rifle is a powerful thing; I would take the 30-06.
I hunt elk with a .338 WM or a .300 H&H, either of which I have tremendous confidence in. If I had even the slightest bit more confidence in hitting with a 30-06 over these rifles, I would sure use it.
And for the record, I have killed elk very dead with a 30-06. Hard to go wrong with 180 gr. Nosler Partitions in the '06 for elk...
