My ER Shaw experience mirrors that of the others who've responded.
Relatively accurate barrels that foul pretty quickly.
I put Shaw just a very small step above the Savage factory barrels which are also accurate bore foulers.
Be aware that Shaw contours run rather thick. Especially in .338" and above. I turned Shaw's lightest .338-06 barrel contour down on a lathe and it maintained the same accuracy and felt much better in the hands.

If I were wanting to experiment I think I'd just try to find Savage factory takeoffs and rechamber them.