Nick,
I think instead of reboring, you'd probably be better off buying a take-off barrel in .308. Your gunsmith would have to reset the headspace for your action, but that's going to be a good deal cheaper than having to rechamber and rebore your current barrel.
Another option would be to buy a pre-contoured barrel, or even a bored blank, from a good barrel maker (Shilen, Douglas, Lilja, etc.) and have it chambered and contoured to your specs. You'll end up with a great barrel, and probably still spend less (just guessing, I've never priced reboring) than doing all that work to your current barrel. Unless you have some sentimental attachment to your current barrel, I can't see any justification to reboring it.
As to gunsmiths, it depends on your expectations. If you're building a benchrest shooter, your choices are narrowed considerably. Otherwise, most well-equipped shops should be able to rebarrel your action with either a take-off barrel, or an "aftermarket" barrel with good results. I did have the name of a company that rebores and rifles barrels, and if you're set on going that direction, I'll try to find the info again.