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The .243 Winchester (6×52mm) is a popular sporting rifle cartridge. Developed as a versatile short action cartridge to hunt both medium game and small game alike, it "took whitetail hunting by storm" [ 2 ] when introduced in 1955, and remains one of the most popular whitetail deer cartridges.
Winchester Super Short Magnum, or WSSM is a line of rebated bottlenecked centerfire short magnum cartridges introduced by the U.S. Repeating Arms Company (Winchester Inc). [1] It is a further development of the Winchester Short Magnum concept utilizing smaller bullets, but of a still higher velocity.
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]
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.
In 1969 the 308 Win. was dropped from production, and by 1970 only the 243 Win, 270 Win, and 30-06 Sprg were offered. Again in 1971 chamberings were reduced to only the 243 Win and 30-06 Sprg. In 1972 the rifle was redesigned to incorporate the same design stock and a 2 position safety similar to that of the Model 70.
There were several faster wildcat rounds available, but the .240 Wby. Mag. outclassed the 6 mm Remington and the newer .243 WSSM by about 150 ft/s (46 m/s). [4] However, the lightweight .243 WSSM 55gr Ballistic Silvertip now outpaces Weatherby's offerings according to some. [ 5 ]
The ballistic performance of the .240 H&H in factory loads is very similar to that of the .243 Winchester, with a 100-grain (6.5 g) bullet with a diameter of .245 inches (contrary to the .240 name) giving a muzzle velocity of approximately 2,900 feet per second (880 m/s).
The 6mm XC was initially developed as a Wildcat cartridge specifically for NRA High Power match shooting by 11-time US National Champion David Tubb. [2] [3] The round originated from chambering a barrel using a .243 Winchester reamer held short, with the case reformed from .22-250. [2]