My philosphy is simply this. The more parts between the receiver and the optic, the more chance of issues and the more weight.
Not an issue with the 338, it's already a tank. I'd never lug that monster anywhere, I'm 64 and too **** old to carry a bazooka. Thats a set up and shoot rifle. My 308 is my carry rifle and I want a lightweight but fairly potent rifle that will handle anything to 500 yards. The 308 fills that bill.
If my 338 didn't come railed, I would have installed Talley One Piece rings/mounts on that as well. As it is, it got Warne's.
I have the same scope you do BTW (on the 338) and one on the 308 as well, just a little bit less magnification.
I'm used to a 3-9, I'm old school, so this high magnification, I hardly ever use it. Most times, the scope is dialed at 4 or 6.5 The eye box is better anyway.