Fluting.
If you flute a barrel, it will be less stiff than it was to begin with.
If you have 2 otherwise identical (length, calibre, etc) barrels of the same outside diameter, one fluted and one not fluted, the non-fluted one will be stiffer.
If you have 2 otherwise identical (length, calibre, etc) barrels of the same weight, one fluted and one not, they will be different outside diameters and the fluted one will be stiffer.
Is "stiffness" the single most important factor that makes a barrel 'accurate'? Probably not, given that you can get a sporter contour barrel to shoot extremely well with tuned loads.
Is it possibly better to have a slightly thinner contour non-fluted barrel and not risk inducing stress in the barrel? Don't ask me, I'm not an engineer or a person who gives a damn, I prefer the aesthetic of non-fluted and they work for me so that's what I go with. Also someone wanted to charge me $330 to flute parts of a 14" barrel. I'll go lift a weight instead I think. $330 nearly buys you a years gym membership!
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