I understand that barrel length has a direct affect on velocity but I was reading somewhere in one of my gun magazines that shorter barrels are more accurate. Not sure if this is true but I have noticed that some government sniper bolt action rifles have gone to shorter barrels. Some 20"! I was fondling a 308 Rem 700 tactical at the gun show yesterday and it had a rather short heavy barrel. I really like this rifle and the weight of the heavy barrel wasn't so bad with it's shorter length.