I'm gong to amend my earlier post.
I recently picked up a Ruger M77 RSM in .375 H&H. took it to my range last week and after one fouling shot I shot two three shot groups - 3/8" and 7/8" with some 260gr. Nosler partition hand loads that it came with.
Nice "new to me" rifle, new caliber for me, very very accurate, so my old Sako Classic .35 Whelen may just stay home this season.