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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.
Common rifle cartridges, from the largest .50 BMG to the smallest .22 Long Rifle with a $1 United States dollar bill in the background as a reference point.. This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name.
The .260 Remington, loaded with very low drag bullets such as the 138 gr (8.9 g) Lapua, 140 gr (9.1 g) Berger, or 142 gr (9.2 g) Sierra, can match the 1,000 yd (910 m) performance of the 190 gr (12 g) Sierra-loaded .300 Winchester Magnum, with better resistance to wind deflection and half the recoil. [12]
The .300 Remington Ultra Magnum, also known as the .300 Ultra Mag, 7.62×72mm or .300 RUM, is a 7.62 mm (.308 inch) rifle cartridge introduced by Remington Arms in 1999. The .300 Remington Ultra Magnum is one of the largest commercially available .30 caliber magnums currently being produced.
The .300 Winchester Magnum has a case capacity of 93.8 grains. While providing ballistic performance nearly identical to that of the .300 Winchester Magnum, 300 WSM does this with about 14 grains less powder. The .300 WSM also head-spaces off of the case shoulder, versus the older .300 Winchester Magnum's belted head space design.
It is chambered for .243 Winchester, .308 Winchester, .30-06 Springfield, .270 Winchester, 7mm Remington.Magnum, .300 Winchester.Magnum, .375 H&H Magnum and .458 Winchester Magnum [1] It is drilled and tapped for scope mounts. It can have a barrel length of 22, 24 or 26 inches. It weighs 7 pounds, and has a brown laminated stock.
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]
Little is known of its usage or technical data, and pictures are rarely available. The pictures that have been released show a Remington 700 Long-Action receiver mated to a McMillan A2 stock. The rifle was chambered in .300 Winchester Magnum. The rifle was the most prolific sniper weapon in the Navy until the advent of the Mk 13 Mod 5.