I have fluted bbls after i recieved them, they all shot very well. I didn't really know that the bore dia could change due to stresses the tooling imparts on the steel. I called several bbl makers and asked them what should i do, i got conflicting reports, one said the bbl is ruined, others said you may need to stress relive it agian and re-lap, and another said just shoot it. The big trick is dont remove much metal on each pass, take your time, this way your not building up massive amounts of stress.
I dont flute bbls anymore, unless its a test gun for my personal use.
My 338 snipe-tac, (personal
was used for a test rifle.
I wanted to see just how much weight i could get off the bbl by using very large flutes. I used a 31/64th end mill, they are deep! Before fluting the gun would shoot .5moa... after fluting the gun shot 1moa, i felt sick...did i ruin the bbl? I totally cleaned the bore and used moly powder to burnish the bore, re-broke in the bbl. After 20 shots the fouling was gone and groups were back and even better, .2moa was this just a fluke? Probally
In my opinon, have the bbl fluted when you order it. This will be the best option. If any thing it will give you peace of mind.