.243 Winchester Super Short Magnum

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243 WSSM
A comparison of the 243 WSSM with 243 Winchester (second from left) and with 22-250 and 223 Remington (far right).
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
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 [1]

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.