The reality is that the tolerance and specs of many high end actions are so tight and precsise, a shouldered barrel cut for a Big Horn or Mausingfield (for example) will precisely fit other like action.
Outfits like Patriot Valley Arms (and several excellent Canadian smiths like Insite Arms) can turn out shouldered barrels that are plug and play, they don’t need to ever see the actions.
Outfits like Patriot Valley Arms (and several excellent Canadian smiths like Insite Arms) can turn out shouldered barrels that are plug and play, they don’t need to ever see the actions.