Not sure what you are really looking for but you can tweak the current setup (ie lugs, trigger, crown etc) for under $200.
Anytime you rebarrel you chamber the blank so caliber is optional as long as the bolt faces match up on the cartridges.
suggest you go to Mark King or Bruce Baer in PA. both are top recommended smiths on www.6mmbr.com.
Both have long history of building accurate hunting rifles and top notch 1k BR guns.
both are very reasonable and can do anything you want.
As long as the gun is shooting at least 1-2 loads sub MOA and reliable, not sure you may want to spend a lot of money on it.