No action's shot match bullets at the longer ranges more accurate than the Winchester Model 70's have. A few have equalled them but only at 3 to 4 times the cost. The modern, high dollar, custom machined precision made single shot bolt actions winning the long range benchrest matches these days in synthetic stocks are no more accurate than what was done decades ago with rifles built around Model 70 Winchester actions put in solid wood stocks. The best of any of them today shoot inside the 6 to 7 inch range at 1000 yards which is what's happened over the last 40 years using Winchester actions.
That aside, there are actions today that are easier to build super accruate rifles with, but they cost a very pretty penny.