Erik Cortina said:If you are already ordering a custom reamer, why not get it with the proper freebore? That's the reason I showed how to make a dummy round so that you can send one to the reamer maker and get precisely what you need.
I agree it sounds like OP is getting one of Kiffs in stock reamers and the smith wants to tweak the chamber a little. But at this stage of this thread I'm just guessing.