I had a boat paddle 338 WM all-weather with sights. It shot more patterns than groups.
....and the gist of this story is, get a rifle you can handle...
Funny, of the 5 or so 338's I've owned, the Ruger was the only one that didn't shoot worth a chit.
I replaced the anvil-like Ruger 338 with a lighter 338 WM, an M700 SS ADL, that shot tiny varminter-sized groups. Actually, one of the best shooting factory rifles I've ever owned... so apparently the Ruger's problem wasn't the operator.