The .25 Winchester Super Short Magnum (WSSM) is a centerfire rifle cartridge introduced by Winchester in 2004. It is part of the Winchester Super Short Magnum (WSSM) family of cartridges, which also includes the .223 WSSM and the .243 WSSM. The .25 WSSM is based on a shortened, necked-down .300 Winchester Short Magnum (WSM) case, which accommodates a .25 caliber (6.35mm) bullet.
The .25 WSSM was designed as a high-velocity, flat-shooting cartridge with moderate recoil, making it suitable for hunting medium-sized game, such as deer, antelope, and wild hogs, as well as varmints and predators. The cartridge provides a good balance of power, accuracy, and trajectory, offering an alternative to other popular .25 caliber cartridges, such as the .25-06 Remington and .257 Roberts.
Typical bullet weights for the .25 WSSM range from 85 to 120 grains, with muzzle velocities between 3,200 and 3,500 feet per second, depending on the bullet weight and load. The .25 WSSM has gained a following among hunters and shooters for its performance characteristics and the compact, lightweight rifles that can be chambered for it.
However, the .25 WSSM has not achieved the same level of popularity as some other cartridges in its class, partly due to concerns about barrel wear and limited availability of rifles and ammunition. Nonetheless, it remains a viable option for those seeking a high-performance, flat-shooting .25 caliber cartridge in a compact platform.