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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.
The United States Special Operations Command uses the MK 13 MOD 5 rifle chambered in .300 Winchester Magnum. [1] The Mk 13 MOD 5 utilizes the "long-action" bolt of the Remington 700/M24 receiver and has a precision barrel that can be fitted with the suppressor of the Mk 11.
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.
The Remington model 770 is a magazine fed, bolt action, center-fire rifle. The 770 is available in 243 Win, 270 Win, 7mm-08 Rem, 7mm Rem Mag, 30-06 Sprg, 300 Win Mag, and 308 Win. The standard, factory magazine can hold up to 4 rounds (3 rounds in the magnum version) plus 1 loaded directly into the chamber.
An experimental variant re-chambered for the .300 Winchester Magnum (7.62×67mm) round. It was not adopted by the US Army due to concerns that operators would not be able to acquire the special ammo. Also, the available .300 Winchester Magnum ammo that was procured sometimes misfired due to incompletely-burned propellant in the longer cartridge.
Specifications (Ruger M77 Standard) ... 7mm-08 Rem, 30-06 Sprg, 300 Win Mag, 308 Win, 338 Win, 350 Rem, 35 Whelan, 358 Win Mag, 416 Taylor, 458 Win Mag, 458 Rem Mag ...
This was acceptable for shooting at materiel, but not people. The XM2010 addressed the problem with a .300 Winchester Magnum round that can hit targets out to 1,200 m (1,312 yd) with a 1 MOA accuracy, half again further than the M24's 800 m (875 yd). On 20 September 2010, the Army gave Remington a $28 million contract to rebuild 3,600 M24 rifles.
A wildcat cartridge based on the .25 WSSM, called the .358 WSSM or .358 BFG, has similar performance to the standard .358 Winchester and .35 Whelen. [6] Additionally, Olympic arms created the .300 OSSM, which is a 25 WSSM necked up to .308” giving performance between 30-06 and .300 Winchester Magnum. [citation needed]
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