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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.
270 Winchester necked down to a .243 bullet with the angle increased to 35 degrees - The 270 Winchester is a standardized cartridge of the same design as the 30-06 except the case is 1.2mm longer and necked down to the .270 caliber. Therefore, the 243 Catbird is a 6mm-06 with a 35 degree shoulder and a 1.2mm longer case. [10]
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]
With the advent of smokeless powder, which has a far greater energy density than black powder, it was possible to generate far more power in the large cases of the older black-powder cartridges such as the .32-40 Winchester and .38-55 Winchester. Some black powder cartridges such as the .32-20 Winchester and .44-40 Winchester were chambered in ...
The .450/400 2 3 ⁄ 8 inch Black Powder Express was loaded with a bullets from 210 to 270 grains (14 to 17 g) driven by 79 to 84 grains (5.1 to 5.4 g) of black powder. The .450/400 2 3 ⁄ 8 inch Nitro for Black was loaded with a jacketed 270 grain round nose bullet driven by 38 grains (2.5 g) of cordite.
The high-velocity smokeless load was in a class with the .444 Marlin, [4] and its power exceeded the .348 [5] and .358 Winchester. [ 6 ] Winchester continued to offer the cartridge commercially until 1935 [ 1 ] and while it is still offered by some suppliers, due to its obsolescence and resultant obscurity, it is significantly more costly than ...