It will cost as much as a new barrel, typically right around $400, and is usually used as a means to restore the bore and chamber while retaining the original markings on the outside of the barrel on rifles having collector or sentimental value. Since you could buy several Mosin-Nagants for $400, I would suggest looking for a replacement barrel or a replacement rifle.
Numrich has replacement barrels for a very reasonable price:
http://www.gunpartscorp.com/catalog/...740&catid=3256