.243 Winchester Super Short Magnum
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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 correct name for the cartridge, as listed by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI), is 243 WSSM, without a decimal point.[3] Winchester has discontinued the manufacture of 243 WSSM ammunition. As of the first half of 2016, Winchester/Olin did manufacture and release for sale some WSSM ammunition. The product is only manufactured periodically, often at inconsistent intervals.
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243 WSSM | ||||||||||||||||||||||||
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Type | Rifle | |||||||||||||||||||||||
Place of origin | USA | |||||||||||||||||||||||
Production history | ||||||||||||||||||||||||
Designer | Browning / Winchester | |||||||||||||||||||||||
Designed | 2003 | |||||||||||||||||||||||
Manufacturer | Winchester | |||||||||||||||||||||||
Produced | 2003–present | |||||||||||||||||||||||
Specifications | ||||||||||||||||||||||||
Parent case | .300 WSM | |||||||||||||||||||||||
Case type | Rimless, bottleneck | |||||||||||||||||||||||
Bullet diameter | .243 in (6.2 mm) | |||||||||||||||||||||||
Land diameter | .237 in (6.0 mm) | |||||||||||||||||||||||
Neck diameter | .291 in (7.4 mm) | |||||||||||||||||||||||
Shoulder diameter | .544 in (13.8 mm) | |||||||||||||||||||||||
Base diameter | .555 in (14.1 mm) | |||||||||||||||||||||||
Rim diameter | .535 in (13.6 mm) | |||||||||||||||||||||||
Rim thickness | .054 in (1.4 mm) | |||||||||||||||||||||||
Case length | 1.670 in (42.4 mm) | |||||||||||||||||||||||
Overall length | 2.362 in (60.0 mm) | |||||||||||||||||||||||
Rifling twist | 1-10 in (250 mm) | |||||||||||||||||||||||
Primer type | Large rifle | |||||||||||||||||||||||
Ballistic performance | ||||||||||||||||||||||||
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Test barrel length: 24 in (610 mm) Source(s): Hodgdon [1] |