I've had good luck with Kimber, so I would buy a new one.
But the other option SHOULD BE a sure thing.
Sounds like a Barrett Fieldcraft is a sure thing too, for about the same money as a rebarreled Montana.
The 243 I purchased from you became a 6.5CM.
Absolute laser! throated for 120-143gr. Loves 130 Berger. No complaints about CMs or Kimbers.
I currently own 223, 6mm-47, 243, Roberts, Swede, CM, and 308.