I doubted the Accuracy of a barrel nut job, common talk is something about a barrel nut is bad in so many ways. Well, a friend died, and left me his Savage BVVS 112 long action in 22/250. I had half an inch cut off the back end and had it chambered to 22/250 AI with zero freebore. I worked up tiny groups with three different powders in one afternoon loading at the rifle range. Groups were in the two's, IMR 4320, Varget, and Win 760 with 55g Bergers.
Next, I upped the game a little, and had a 27" Max heavy varmint Brux 8T threaded and chambered for a nut job in 6 Dasher. This barrel is still going strong, had another one done with the same reamer but left at .030 freebore for lighter bullets on a 14 Twist barrel, with 55g Noslers at 4130 going into groups that open up a bullet hole with AA2230, Rem 7 1/2. Then I bought a Savage single shot, and made it into a 223 AI, this barrel also shoots bug holes.
So, the lesson to be learned, I think a lot of people repeat BS that they have heard, and this BS just goes round and round till it is a commonly accepted fact.
A more important issue is how well the barrel is indicated in prior to being chambered and threaded, and this issue is HUGE!
I am not a big savage fan, but I have three single shots with custom barrels, two in laminated stocks, and the 7 Mag Hart 9T in a McMillen F Class A 5. These Savages hang with some of my custom action rifles.