Mike does not have a chamber list, as he can do any chamber you want. Via CNC machining. Providing it is safe. I had him do one barrel in a 9.3x74R. The chamber itself, hasn't the finish(polish) I'm used to. But that is of little consequence, and actually may help with this round. His chamber on this barrel is tight and finish is very good. Just getting started shooting it. I sent him a drawing of a 338-74R Keith with dimension changes that I wanted. Just waiting for a quote on the dies. I had ordered a 338-06 AI, but stopped it, when this idea came into mind.