I wonder if there are any machinists who rough out the chambers with a boring bar on a CNC lathe and then EDM to finish the chamber? I think that would give good results.
It would be interesting to see this guy check concentricity
because the tolerances on the rifled bore aren't nearly that close.

I like to do my hunting BEFORE I pull the trigger!
There is only one kind of dead, but there are many different kinds of wounded.