I bought my custom 25 creedmoor Shilen barrel through Northland Shooters Supply--like it so much I bought a second one as back up--probably do the same for my 30 BR barrel; but that's strictly for a shooter who loves getting into the weeds with making brass.
NSS also works with Criterion who's match grade lapped barrels are excellent in my experience. It's a great fast cartridge and one that isn't going to fry out your bore.