Go with the match chamber in 1/7" twist. I have no experience with cut rifling barrels but have heard numerous times they can be a bit more accurate than button rifled. I have no accuracy complaints with the button rifled barrel I've used for my builds. Shilen, McGowan, CBI, etc, are all good barrels. Bartlein and Pac-Nor are a step up and cost more. Unless your going to compete in bench matches, I think you'd be happy with the first three I mentioned.
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