It may depend on what you are trying to do. When You start getting into the 450 range buying a profiled blank starts looking like a good option. That is where you can get the barrel chambered for not only your cartridge but if you're going heavy(long) the smith can cut the throat where it needs to be as well.
It could be said that the difference between .4" groups and .2 groups is the money spent on the barrel.
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