I used to, Custom Build, Mauser 98's in, the 1970's, 80's to, mid 90's ( did Bluing, Custom Glass Bedded, Finished & fitted stocks, Installed Barrels, Pads, etc. ) I used to buy Douglas, Premium Bbl's from, Brownell's and Hand Chamber them ( Hand ream, as they were, "short Chambered" & set, Headspace ) cut / Crown, etc. They ALWAYS shot, Sub 1 MOA in, .25-06, .270 Win, .280 Rem and .30-06 ( Test shot, W/ Fact. Rem. Corelokt's ) before, I sent them out, the Door.
You might check with, Brownell's to see if they are still available, IF you have access to, a Reamer, Lathe and other Tools Nec. OR, check to see, how reasonable $$$ wise, a Gunsmith would charge to Install one. Douglas Barrels were ALWAYS, a Reasonably Priced,.. "shooter" barrel and heard that, they still, ARE !