Not a problem
We have not done enough barrels to give an honest answer for everything that is out there, if the barrel has been stress relieved correctly then nothing much should change when fluting the barrel, if there is going to be any changes then threading a barrels muzzle should have a greater effect on bore size than fluting as more material is removed. True flite for one flute their barrels post rifling them. There are many other button barrel manufacturers out there that say yes you can flute their barrels and many that say no not a good idea.
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