The Turks are generally a large ring, small thread action. They can be rebarreled to 270, 280, 30-06 without any trouble by getting the right barrel. If the gunsmith is starting with a blank he just threads it to the smaller size. If you are ordering a barrel just order the right size. Some companies are hesitant to send out small thread barrels in the more potent calibers for fear that someone will screw them into a 93 or 95 actions and bad things could happen. Just make sure they understand you are having it installed on a turk and should have no problems.