Barrel Length has ZERO to do with accuracy !! The only thing is can affect and have an effect on is velocity and that's it......A short stiff barrel in one cartridge may shoot this way or that, it may vibrate correctly or it may be totally off balance.. I watch a guy at the hog matches with a 6.5X284 fairly light weight barrel and I'd say was around 30 inches long, that had so much barrel whip that you could see it with you own eyes, and it went on for 2-3 seconds after the bullet was long gone BUT it would shoot sub two inch groups at 500 yards..go figure!