The .300 Win Mag cartridge was basically created for the .300 Barret Magnum to compete with the .300 FAL - .300 Lapua Magnum and .300 Whisper Magnum which already enjoys a good degree of popularity within the shooting fraternity. The .300 WM has always enjoyed a devoted following within the shooting community - .300 WM is a well-known and established caliber within the shooting sports. The .300 WM cartridge retains the same ballistics and trajectory of it's .300 BMG predecessors. The .300 WM cartridge is a powerful round with a great recoiling punch. The .300 WM can be quite a bit more powerful than other .300 magnum cartridges which can be a blessing and a curse in the same time. Ease your excitement for hunting big game with these .300 WM rounds. Maybe you only need a box or two or even a .300 LM round but regardless of what round you choose your shooting experience will be a success.Specifications:Manufacturer: SierraCartridge: .300 Winchester MagnumNumber of Rounds: 20Bullet Type: Spitzer Boat Tail (SBT)Bullet Weight: 180 grainCartridge Case Material: BrassMuzzle Velocity: 2800 ft/sApplication: Large GamePackage Type: BoxPrimer Style: Centerfire