Last pre-fit barrel I ordered came from X-Caliber. 6mm Creedmoor 18" Savage Mag contour, spiral fluted, and threaded muzzle took 8 weeks to get, but was told 12.
Good news is you want a 6mm, most barrel makers have the rifled blanks on the shelf. 7 & 8 twist will probably be what they have the most of with everyone wanting to shoot LR. If you want a heavy sporter go with the Savage Mag contour. KISS and the barrel maker will have it to you much sooner than expected. That's the best advice I have on wait times.
My other suggestion go at least 1:8 twist. I've never found myself waiting a slower twist afterwards, bt a couple of times I have regretted not having gone faster. It also gives a little more insurance on the bullet stability end. I built a 6X45 because the .223 isnt legal in my state for big game, if it wasn't for that reason I'd just build a 1:7 .223 rifle.
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