http://rifleshooter.com/2013/12/300-winchester-magnum-how-does-barrel-length-change-velocity-a-16-300-win-mag/#prettyPhoto
This I a pretty interesting article. They basically take a rifle and a hacksaw to the barrel a inch at a time.
This I a pretty interesting article. They basically take a rifle and a hacksaw to the barrel a inch at a time.