I think before this post drops down to far, I would like to add a couple comments. They are not directed at anyone, just off the cuff thoughts on folks wanting to do this.
Just swapping a barrel out regardless of the quality of the workmanship to build you a custom barrel will mean nothing without the rest of the package being complete. It would be a lot like putting the best off road tires made on a totally stock truck and hoping you would have a Baja Race ready ride.
Once a new custom barrel is mounted properly to the rifle, you must have a perfect bedding job done, the screws into the stock through the reciever must be torqued properly, the scope rings and bases must be measured for out of round, and tightened to spec, the choice of scope makes a significant difference. The base line by which all others are judged in this country is Leupold. Better is great, but less then a simple Leupold removes the advantage of the custom barrel.
After all this, you need to know the distance of the ogive of the bullet to the lands in the barrel. Then you need to seat your bullets to the correct depth for best accuracy. Not every bullet is created equal, you will need the tools to measure this and then check the group size, adjust the depth as needed or scrap that bullet and move to another weight or manufacturer. As an example most TSX bullets will be best between 20 and 50 off the lands.
Too close may give you great accuracy but too high a pressure. They may also be too long for the magazine. So you need to find that perfect bullet. Unfortunately we don't often get to choose the absolute best bullet, the barrel does.
So just deciding to get that custom barrel ans shoot one hole groups is not a realistic view. It will take lots more then just paying 500-800 bucks for the custom barrel and having perfection. The new barrel is the easy part, it's being able to pull together the whole package and the loads that will make the project come together.
If for example your never gonna reload, then you will not likely ever see the kind of results possible with that barrel, and may not even shoot as well as a simply factory barrel. Accuracy will unfortunately always seek the weakest link in the package to create frustration for you!