http://airbornecombatengineer.typepad.com/airborne_combat_engineer/2006/02/barretts_propri.html Airborne Combat Engineer's article on the .416 Barrett] Barrett claims that this cartridge is capable of propelling a 398 gr solid brass boattail spitzer bullet out of the 32 inches barrel of a Model 99 single-shot rifle at 960 m/s (3,150 ft/s), giving it a ballistic coefficient of .720, and keeping the projectile supersonic out to 1,737 meters (1,900 yards, ~1.2 miles).