I see it everywhere but I am not convinced of its effectiveness on barrels and more particularly on the bolts of rifles. Why would you flute a bolt?
Well now there are all sorts of different styles. Is one better than another or do they have different purposes? As far as a barrel is concerned.
I stand on one foot and hop in a counter clockwise circle chanting "boom shuka luka luka boom" I swear it works for me, my groups are better, try it!!!
A little chicken blood on the bolt also helps