Ask most folks what the fluting is for and they'll tell you it's for cooling, which is just wrong...in order to cool substantially faster, the bbl would need to at least double in surface area, most fluted bbls might be lucky to get to 1.25-1.5x the surface area....the big advantage of them is that you get the same weight of a standard heavy bbl, but you get a larger diameter bbl, making it stiffer, or if the diameters are the same, you get a lighter rifle-one contention I often hear, which there may be some logic to- if the last 4-6" of the bbl aren't fluted, there's a small weight shift towards the muzzle, which acts slightly as a stabilizer.