Any competent gunsmith that does barrel work should be able to help you. There is no mystique to the Ruger 77, or any other make of receiver for that matter. A simple re-barrel should not require a "specialist". Any gunsmith that is worth his "salt" should be able to do the work that you want. "It's not rocket science or brain surgery". It's simple mechanics, math and refined machining techniques that a gunsmith (that does custom barrel work) uses. It completely boggles my mind to think that it would take a "specialist" to custom fit and chamber a custom made barrel blank to a Ruger 77 (or MK2), Winchester, Howa, Remington, Mauser, CZ, Springfield or 1917/P14 'Enfield', (or any other model for that matter). The only 'hang-up' for a competent 'smith would be if his lathe is not metric thread capable,,,,, and the Ruger 77 uses a simple 1" x 16TPI US thread. Competence is what you should look for, not necessarily a "specialist" for whatever action.