Micky,
I’ve designed and had built a few wildcats which required special custom reamers for the chambers and the dies. I sent the drawings I drew to Dave Manson and he made the reamers. I used removable pilots because I used the same case design was for several different calibers.
I would use Mason’s services again. His price was reasonable, I was able to speak with him by phone about what I was trying to do, and turn around time was very good. He does very high quality work.
my experience with Manson as well