I am not sure who else chambers the 338-R.U.M.? Sako would be my first guess?
I have shot the 300, 338& 375-Remington Ultra Mags.All threerifles were remingtons &all were good shooters.
The 338-R.U.M.is one heck of a elk rifle.

Iboughta 375-R.U.M. just for grins lastwinter. I speak from first hand experience. The 375-R,U.M. kicks hard, but is fun to shoot game with.
I am sure the 338-R.U.M. willbe the same way.