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

I'm interested in having a miniature martini modified to centrefire and then having a 30 cal barrel chambered in 32 S&W Long or 32 H&R Magnum. 32 S&W L is almost extinct and 32 H&R Magnum is very thin on the ground. I expect I will have to make a reamer. I've read about D-type reamers which can be effective for a few chambers. Has anyone got advice on what would work for this make-your-own reamer project?