.243 Winchester Super Short Magnum

243 WSSM
A comparison of the .243 WSSM with .243 Winchester (second from left) and with .22-250 and .223 Remington (far right).
TypeRifle
Place of originUSA
Production history
DesignerBrowning / Winchester
Designed2003
ManufacturerWinchester
Produced2003–present
Specifications
Parent case.300 WSM
Case typeRimless, 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 length1.670 in (42.4 mm)
Overall length2.362 in (60.0 mm)
Rifling twist1-10 in (250 mm)
Primer typeLarge rifle
Ballistic performance
Bullet mass/type Velocity Energy
58 gr (3.8 g) VMax 4,068 ft/s (1,240 m/s) 2,132 ft⋅lbf (2,891 J)
70 gr (4.5 g) BT 3,707 ft/s (1,130 m/s) 2,136 ft⋅lbf (2,896 J)
80 gr (5.2 g) BTSP 3,545 ft/s (1,081 m/s) 2,233 ft⋅lbf (3,028 J)
90 gr (5.8 g) SFT 3,280 ft/s (1,000 m/s) 2,151 ft⋅lbf (2,916 J)
100 gr (6.5 g) BTSP 3,136 ft/s (956 m/s) 2,184 ft⋅lbf (2,961 J)
Test barrel length: 24 in (610 mm)
Source(s): Hodgdon

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. The correct name for the cartridge, as listed by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI), is 243 WSSM, without a decimal point. 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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