Thread: How to make a D-type reamer to chamber a barrel

so....you talking lead/throat.... well to my simple non engineering mind you garden variety drill bit has what 45 degree angle ,you run correct size in to remove the rifling to required depth...then do chamber with boring bar.... @homebrew.357 feel free to chime in here.

Originally Posted by Micky Duck

so....you talking lead/throat.... well to my simple non engineering mind you garden variety drill bit has what 45 degree angle ,you run correct size in to remove the rifling to required depth...then do chamber with boring bar.... @homebrew.357 feel free to chime in here.

Problem is centering the chamber according to the bore. I understand chamber reamers need a special flexible holder when used in a lathe to allow them to find their own way according to their bore pilot. Sure you can use a boring bar to make a chamber, IF you have the barrel perfectly centered in the 4-jaw chuck. It must be centered according to the bore and not to the outside of the barrel.

There are also plenty, cheap, straight reamers on Ali Express.