How to Rechamber a Rifle Using a Drill Press
The rifle chamber is located within the barrel, which is threaded into the rifle receiver. Re-chambering requires you to select a cartridge larger than the one with which you begin so that you can remove metal, enlarging the chamber to fit the new cartridge. Do not change calibers as this will require re-boring the barrel. Usually, re-chambering requires replacing the ejector on the bolt.
how to use a mortising attachment on a drill press