You can get a rifle rebarreled for a few hundred bucks or you can get it done right. Which way you go depends on just what you want, if you want a rifle to hunt with and will settle for a 1.5"+or- at 100 yards then go the cheeper route. If you want a guaranteed shooter then it will cost more.
A barrel like a Shilen Match grade will run a bit under $400 lap the recoil lugs and square the action from $50 to $100 depending on time. Head spacing about $50. In addition to this you will have blueing, $150 and mabe opening up the barrel channel and a glass bedding job.
All in all not a cheep proposition but if done right you get that sub half minute of angle rifle. On the custom rifles I build or barrel I take the involved route but we guarantee 1/2" or less groups with an accuracy load. Going the less expensive way you may get a shooter, you may not but what it boils down to is what will make you happy with your rifle.
Bye the way have you thought of just rechambering and opening up the bolt face for some thing like the .308 Norma mag or the .300 Winchester? Cost wise that would be the cheapest route and still allow you to lap the lugs and stuff like that.