I like ICANHITHIMMAN's advice on using/supporting those here and agree:
"These guys are some of the top builders in the industry"
I can attest for SSG
(Nate) quality, accuracy, and detail. Plus Nate is well tooled that makes some very innovative gunsmithing components and does a fair amount of work for other smith's.
The last barrel Nate chambered for me I have now shot 6-times at IBS-1000yd matches that averaged 7.6" (10-shot groups).