My first was a 77V in 25-06, with fiddleback from end to end. I never should have sold it. I have one in 30-06 now, and one in .338WM. Neither will get sold any time soon, tho I haven't hunted with the .338 in 15 years or so.
I've had no trouble getting any of them to go 1.5 MOA or less. The 77V, totally unmodified, did 5 MOA with factory, 1 MOA with neck-sized only reloads. The .338 goes MOA with some "junk loads" I threw together without work-up, using Hornady 250 RN, and 1 inch groups (3 shot), at 200 yards with some Sierra 250 - also not worked up. I have 3 of the Sierras left, and about 30 of the Hornady loads.
Glass bedded receivers, free floated barrels, and factory triggers worked on. The 338 has also been Mag-Na-Ported.
I've never had a Mk II.
