Here is my take on it, and most will probably disagree, but I'm happy with my 1/4-to-1/2 minute factory reworked "customs". You can laugh and joke all you want, but there's a reason I keep using factory barrels, and I will discuss that in this post. Also, a 1/2 minute gun still means potential 5" group capabilities at 1000 yards. And that's more than enough to kill a deer, especially anything larger with a bigger vitals area.
All of my custom rifles are basically just completely worked and trued factory rifles with worked-over Sendero barrels. True the action and lug, true the barrel threads, true the shoulder, reset the headspace with a good quality reamer, hand-lap the bore, and recrown the muzzle. Bed the action and float the barrel, and you have pretty much the same thing as a custom rifle and barrel. You spend $250-300, over the cost of the rifle, and you are basically giving it every chance the factory rifle is capable of, and if that barrel still won't shoot, then something is probably wrong with your brass or loads.
Barrel steel is barrel steel... The main difference in a factory bore and a $350 blank, is the $350 blank was rifled, and then hand-lapped. If you hand-lap a well-rifled factory barrel with a good bore, you're going to get good accuracy. And if the rest of the rifle is trued up as well, then you're adding even more potential. If a barrel is made of the same material, and is bored and rifled to proper specs, hand-lapped, regardless of whether it is stamped with an aftermarket name or a factory name, then what is the difference?
Now, there are some exceptions. Some barrels are faulty from bad rifling buttons, some have crooked chambers, some have oversized chambers, etc... And those barrels, are not much that can be fixed, so yes, those can become tomato spikes.
Not every factory barrel is a winner, but you will find more good ones than bad ones, if you give them half a chance. Even if the rifling looks a bit roughly cut, a good hand-lapping (or fire-lapping with the Tubbs bullets) will help most of that out.
The reason I build these, is because I can do it cheaply (about my only budget option at the moment), and because no matter what someone else tries to tell me, I have 5 of them sitting in the safe that will remove all doubt once you shoot them with handloads.