Does anybody have a ballpark guess on what a good price would be for someone to cut a new chamber on an old barrel?

I have an old model 38 arisaka carbine with a very sloppy chamber....it might not even be worth the cost of the re-chambering b/c the barrel may also be too tired, ...but let's say it had a good bore and bad chamber. In this case I would be asking someone to rechamber a 6.5 X 50 Japanese chamber to 6.5 X 55 Swedish. I know the action would handle the pressures of average Swede loads... and suspect the re-cutting of the chmber would give me a much improved chamber.
Anyway, just curios about what it would cost to have someone do this WITHOUT removing the barrel.