tough to answer the go/no-go gauge question without knowing what caliber you intend on building.
How are you planning on headspacing, short chamber or long chamber? short chamber requires a finishing ream of the proper caliber, long chamber requires a lathe.
My mistake. The barrel that I have is a .308 varmint takeoff. Depending on how the barrel will headspace is I may need to ream the chamber or remove material off the shoulder to adjust.