CBI barrels are well known & accurate..prob from NSS ?
Been spinning Savage barrels on/off for 20 yrs or so
Pac Nor has always been my barrel of choice for odd ball p/dog calibers
I've always used FL sized brass instead of go/no go gauges to set HS
Factory barrel nuts are usually very tight....vise suggested...Kroil....heat gun
https://www.brownells.com/gunsmith-.../barrel-vises/barrel-vise-prod58959.aspx