I will say that it worked for me. I had a 1 1/2 MOA rifle (Rem XCR long range/tactical .308, factory barrel, fluted stainless) with a throat that was about .360" deep. A 168gr SMK was out of the case before it got into the rifling. Had it set back .500" and rechambered with a 168 gr. FGMM as the intended round. Now it shoots 100 yard 1/2" 5 shot groups if I do my part. BUT..... If I had had to pay a smith to rechamber it, (I had connections) I would have not used the factory barrel. I would have purchased a new barrel rather than gamble on the factory barrel.
*Note* For those that suggest finding a load that the rifle likes, in my case, there was no load that it liked. The best load/combo, was a 175 FGMM and that was the 1 1/2" groups. And it was seriously unpredictable even with that! Rifle was purchased in Feb of '09 during the 1st Obama buying craze and I am sure that Rem was shoving them out the door just as fast as they could pull 'em off the assembly line, so I have no doubt that a lot of my demons were related to that.