Rather than rebarrel your Montana, another option would be to buy a Hunter in 6.5CM and drop the barreled action into the Montana stock. The Hunter can be found for quite a bit less than MSRP ($800) and you wouldn't have a threaded muzzle on the Hunter so no brake or thread protector to worry about. Talking of thread protectors, the Montana rifles ship with the Adirondack version but you can always order the Mountain Ascent version which is nicer.
