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The .300 Winchester Magnum (also known as .300 Win Mag or .300 WM) (7.62×67mmB, 7.62x66BR) is a belted, bottlenecked magnum rifle cartridge that was introduced by the Winchester Repeating Arms Company in 1963. The .300 Winchester Magnum is a magnum cartridge designed to fit in a standard rifle action.
List of Winchester Center Fire rifle cartridges.More commonly known as WCF, it is a family of cartridges designed by Winchester Repeating Arms Company. [1] There are many other Winchester cartridges that do not carry the WCF moniker, such as the .300 WSM. .270 Winchester, and .300 Winchester Magnum
A magnum cartridge is a firearm cartridge with a larger case size than, or derived from, a similar cartridge of the same projectile caliber and case shoulder shape. [clarification needed] The term derives from the .357 Magnum, the original revolver cartridge with this designation.
The .300 WSM also head-spaces off of the case shoulder, versus the older .300 Winchester Magnum's belted head space design. The advantage to this round is the ballistic performance is nearly identical to the .300 Winchester Magnum [ 2 ] in a lighter rifle with a shorter action burning 8 - 10% less gunpowder.
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Due to the gaining popularity of the 7mm Rem Mag, in 1963 Winchester launches the last member of the Winchester Magnum family of cartridges; the .300 Winchester Magnum; a standard length action belted magnum driving a 180 grain bullet at 3000 fps and a 150 grain bullet at a muzzle velocity of 3300 fps. The cartridge took off slowly but managed ...
The throat of the .300 Styria Magnum is similar to the proven .308 Winchester and short enough to seat the bullets to the lands without exceeding the maximum length of 84.8 mm (3.339 in) to fit the original Mauser 98 magazine. The thick-walled 8×68mm S parent case manufactured by RWS can handle a usage piezo pressure up to 460 MPa (66717 psi).
All of the WSM cartridges are inspired on the .404 Jeffery non-belted magnum cartridge which is shortened to fit a short rifle action (such as a .308 Winchester). [1] It was developed by Rick Jamison in 1997-1998 as proven in a 2005 lawsuit Jamison vs. Olin Corporation-Winchester division. [2] Jamison was given 7 patents on the cartridge design.