Re: Recontouring a barrel
A few barrel makers contour and flute as the last step before they ship. They use heavy high speed cnc lathes and they still loose barrels to chatter and warping.
I lead slug every barrel as part of our quality control checks and have found every manufacturer cut or buttoned will frequently be loose under the flutes and on thin contours get looser towards the muzzle.
Anytime you cut metal it relieves stress so depending how much is cut it will change the bore size slightly. A couple tenths of a thousands won't hurt anything as the bullet bumps up under pressure and seals just fine.
If you can't do it yourself I doubt you will get anyone to do it. Kind of a rule that if a gunsmith wrecks something he buys it. Any chatter on a cut this big and you might never get it out. Better to pass than take this risk.
Build a man a fire and you heat him for a day.
Set him on fire and you heat him for life.
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Gordy and Brady.