Inherent accuracy isn't conditional accuracy, and it's not predicated on shooting in a gravity-less vacuum. When trying to determine the absolute accuracy of a round, they're often shot in a tunnel range with a test barrel rig, which tend to have short, fat barrels. Short range benchrest shooters tend to use shorter, fatter barrels chambered in cartridges with unusually good internal ballistics, because at that range wind drift isn't nearly as much of an issue. I think you're reading way too much into what I said originally. Of course everything is going to be a tradeoff; you wouldn't want to shoot a 6" .300WM any more than you would a 48".