I have done it many times using adjustable reamers and tools to hold them that I made myself. I am not a machinist, just a lifelong tinkerer with a good set of brains. If you will really only do this one set, having a reasonably priced 'smith like our good friend Mike Orlen do it is economically sound. However, Mikey just told a friend of mine that stock bending was the only thing he wanted to do, now. If that's not correct, I hope Mike will 'splain what I heard.
I just heard from Mike Orlen and he assured me that my friend had definitely misunderstood what Mike had told him. I have no problem imagining this particular friend misunderstanding things. Mike is no longer doing "general gunsmithing" but is still interested in all sorts of barrel work AND stock bending. This is not even real news. I apologize if I caused any sort of misunderstanding. Mike Orlen continues to be the first person I would recommend for shotgun barrel work, etc.
jl