The reputable barrel makers such as Lilja, Krieger, Rock, etc will not cut the flutes too deep.
When you build a hunting rifle and hang a 30 -34 inch barrel off of the action you have to make some compromises between wieght and stiffness. Fluting may be one compromise. The other routes are to use a very stiff action or to go to a barrel block. Such a rifle will normally be guaranteed by the gunsmith to shoot under 0.5 MOA and in reality will shoot something like 0.25-0.3 MOA .
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