Buffalo Bore Barnes TSX Supercharged 300 Winchester Magnum 180gr Tipped-FMJ Rifle Ammo - 20 Rounds - This is a full power+ 300 Win. Mag. load that is designed to shoot targets such as deer and sheep well past 500 yards with precision, yet the bullet will give ample penetration for large elk and moose. This load can also be used for such tasks as 2,000 lb bison, but only if you stick with broadside/double lung shots. As always Buffalo Bore derives it published velocities from real-world firearms and refuses to get involved in the industry wide duplicitous practice of advertising velocities that can only be achieved in extra long laboratory barrels, which the customer will never realize with stock rifles in the field. Notice our below velocities.