A guy here had one of the first run of M77 .220 Swift, reportedly with Douglas barrel. It was extremely accurate, so accurate that he quit wasting barrel life on varmints and casual targets and shot it in benchrest matches with factory category. He won much more than the cost of the rifle in cash match prizes.
Another fellow had a thing for 7x57. His Ruger in the caliber was dismal, in spite of a new barrel on the second return. So he had a gunsmith put on a Douglas. Why he went up to .280 Rem, I don't know, but it works. He reports that its non-magnum bullet will NOT bounce off elk hide.