While I agree SSK, TC and most other custom barrel makers would do an excellent job, any local gunsmith or even machinist worth his salt should also be able to cut and re-crown the barrel to your specs no problem. They might even be cheaper, and you'd save the extra cost and time of shipping both ways. Just a possible alternative, but IMO its not a modification that requires a TC smith, barrel maker or even a gunsmith.
YMMV