As I understood David's original question he is referring to a tool for cutting the rim seat, nothing more, nothing less. This tool is pictured & dimensioned in the L C Smith Plans & Specifications book which I presume is what he was referring to. It cut no other portion of the chamber & was called a Heading Tool. I do not know if anyone offers these independly of the entire chambering reamer currently or not. Any good toolmaker could of course grind you one, but it would not be in-expensive.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra