From what I've seen while looking for a barrel to build a 30 BR, the 10 twist seems to be the "off the shelf" twist that available. Anything different was $pecial ordered and co$t$ extra.
I think it was Pac Nor (?) that wanted an extra $125.00 (one time charge) to build a button to cut a 16/17 twist? And the special made tool would be scrapped after the barrel was cut?Wouldn't be too bad if you were ordering maybe 5 barrels at a time. :

It's been a while since I started looking so maybe the barrel makers have change a bit now that the 30 BR in different twists are becomming more popular?
Ask around about prices with the different makers and see what you can come up with. Be interesting to see if they've made any pricing changes, Mike.
[/ quote]. You could always call krieger barrels or Bruno's shooters supply , I paid $299 for a 30"HV 17 twist a few months ago .