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The 243 Winchester Super Short Magnum or 243 WSSM is a rifle cartridge introduced in 2003. It uses a .300 WSM ( Winchester Short Magnum ) case shortened and necked down to accept a .243in/6mm diameter bullet, and is a high velocity round based on ballistics design philosophies that are intended to produce a high level of efficiency. [ 2 ]
The .243 is based on a necked down .308 Winchester, introduced only three years earlier. Expanding monolithic copper bullets of approximately 80 [3] to 85 [4] [5] grains or traditional lead rounds of 90 to 105 grains with controlled expansion designs are best suited for hunting medium game, while lighter rounds are intended for varmints. [6] [7]
Typical rifles for the WSM line of cartridges have barrels between 22–24 in (560–610 mm) which is less than the typical magnum rifle. The short action combined with short barrels allow for a lighter rifle than a standard magnum rifle which would be based on a standard action with a 26 in (660 mm) barrel.
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.
Built from 1966 to 1979. The barrel length was 22" and had a weight of 7lbs. The Sporting Rifle was originally offered in .225 Winchester, .243 Winchester, .270 Winchester, .308 Winchester, and the .30-06 Springfield. [5] In 1969 the 308 Win. was dropped from production, and by 1970 only the 243 Win, 270 Win, and 30-06 Sprg were offered.
Marlin Model XL7, a long action center fire bolt-action rifle available in .30-06, .270, and .25-06; Marlin Model XS7, a short action center fire bolt-action rifle available in .308, .243 Win, and 7mm-08; Marlin Model 1881, one of the earliest large caliber lever-action repeating rifles
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The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges. To obtain maximum accuracy, bullet weight and form are matched to the rifling twist rate of the barrel. Typically, 68 gr (4.41 g) bullets are used in barrels with twist rates of 1 in 13 ...