.223 Winchester Super Short Magnum
.223 WSSM with 75 gr (4.9 g) Hornady AMax bullet
|Place of origin||USA|
|Parent case||.300 WSM|
|Bullet diameter||.224 in (5.7 mm)|
|Neck diameter||.272 in (6.9 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||2.36 in (60 mm)|
|Rifling twist||1-7" to 1-9"|
|Primer type||Large rifle|
|Test barrel length: 24"
Source(s): Hodgdon 
The .223 WSSM was introduced in 2003 by the Browning Arms Company, Winchester Ammunition, and Winchester Repeating Arms Company. It is a shortened .300 WSM (Winchester Short Magnum) case necked down to accept a .224 caliber bullet. The .223 designation is a reference to the popular .223 Remington. It is currently the fastest production .22 caliber round in the world with muzzle velocities as high as 4,600 feet per second (1,402 meters per second; about Mach 4.1).   
Even before the cartridge was commercially introduced, it was claimed that it would be extremely hard on barrels, with high wear leading to short barrel life. Another criticism is that although the round is suited for long distances range vermin hunting, it is not good for medium game any farther than 200 yards. 
The Winchester made Model 70 in .223 WSSM has not been revived in the new Browning-made Winchester Model 70s, but Browning has chosen to use chrome-lined barrels on all of its guns chambered for .223 WSSM and has introduced the .223 WSSM cartridge as a chambering in its A-bolt rifles. Browning rejects the charge that the .223 WSSM round is especially hard on barrels: "The 223 and 243 WSSM cartridges are said to 'burn up' barrels in as little as 300 rounds. Nothing could be further from the truth."
According to Browning, the .223 WSSM offers a 600 ft/s (180 m/s) gain, with a 55 gr (3.6 g) bullet, over the standard .223 Rem. It also offers a 440 ft/s (130 m/s) gain over the 22-250, a popular vermin round. This comes out to a 600 ft·lbf (810 J) gain over a standard .223 Rem, and a 350 ft·lbf (470 J) gain over the 22-250.
- Winchester Short Magnum
- Winchester Super Short Magnum
- .220 Swift
- List of rifle cartridges
- Table of handgun and rifle cartridges
- 5 mm/35 SMc
- 5 mm caliber
- .223 Remington
- .223 WSSM data at Hodgdon Online
- "223 Winchester Super Short Magnum History and General Information:". gunnersden.com. Retrieved 31 October 2013.
- "World record 4700 fps 223 WSSM explodes watermelon better than". youtube.com. Retrieved 31 October 2013.
- ".223 Winchester Super Short Magnum (WSSM)". ballisticstudies.com. Retrieved 31 October 2013.
- ".223 Winchester Super Short Magnum Ballistics". gundata.org. Retrieved 31 October 2013.
- ".223 Winchester Super Short Magnum". leeloadmaster.com. Retrieved 31 October 2013.
- ".223 Rem vs. .223 WSSM". fieldandstream.com. Retrieved 31 October 2013.
- Browning Press Release
- Chuckhawks .223 WSSM page
- Reloading info from Guns and Ammo Magazine
- Super Short Magnums - The Rest of the Story
- Super Duper Shortie