Like Big Country Says the barrels are really tightened down and industrial strength loctite is used. Lots of Gunsmiths won' t work on a A bolt for whatever reason they may have . The ones I have owned 7 mag and 300 wsm I saw no need to go the custom barrel route they all shot great very accurate rifles. There is no guarantee that going the heavy barrel route and restocking the barrelled action that your gun(s) will be that much more accurate.