25 WSSM cartridges loaded for an AR-15 magazine. For comparison, a 2 3/4" shotgun shell & 5.56mm NATO cartridge are included
|Place of origin||USA|
|Designer||Browning / Winchester|
|Parent case||.300 WSM|
|Bullet diameter||.257 in (Script error mm)|
|Neck diameter||.305 in (Script error mm)|
|Shoulder diameter||.544 in (Script error mm)|
|Base diameter||.555 in (Script error mm)|
|Rim diameter||.535 in (Script error mm)|
|Rim thickness||.054 in (Script error mm)|
|Case length||1.670 in (Script error mm)|
|Overall length||2.36 in (Script error mm)|
|Primer type||large rifle|
|75 gr (Script error g) VMax||3,775 ft/s (Script error m/s)||2,374 ft·lbf (Script error J)|
|85 gr (Script error g) BT||3,547 ft/s (Script error m/s)||2,375 ft·lbf (Script error J)|
|100 gr (Script error g) BT||3,264 ft/s (Script error m/s)||2,366 ft·lbf (Script error J)|
|115 gr (Script error g) BT||2,999 ft/s (Script error m/s)||2,297 ft·lbf (Script error J)|
|120 gr (Script error g) SP||2,985 ft/s (Script error m/s)||2,375 ft·lbf (Script error J)|
|Source(s): Hodgdon Online Reload Data|
The .25 Winchester Super Short Magnum is a third member of the Winchester Super Short Magnum (WSSM) cartridge family created by Winchester and Browning. It is the largest caliber of the WSSM's and is the most capable of handling large game such as deer and wild boar.
It is a necked-up version of the .243 WSSM, which is in turn a shortened .300 WSM (Winchester Short Magnum). The WSSM cartridges are based on ballistics design philosophies that are intended to produce a high level of efficiency.
Like other WSSM cases, the .25 is short and fat, which is designed to be more efficient. However, short fat cases with an abruptly angled shoulder and have been criticized by some as being difficult to feed properly in some rifles.
Unlike the other WSSM rounds, the .25 is a magnum in name only, based on the case it uses. Performance wise it is a clone of the .25-06 Remington, making it well suited for medium to large game. The 25 WSSM provides the same performance as the 25-06 Remington, with the advantage of having lighter short action rifles. Having the short fat design, the cartridge loads burn at a more consistent rate, providing a higher level of accuracy. Performance is far less than other .25 caliber magnum rounds as the .257 Weatherby Magnum. In fact, ballistically it's almost identical to the improved version of the .257 Roberts, which P.O. Ackley said was his favorite choice for an all-around cartridge.
- The Experts Agree - The WSSMs are Winners! - Browning
- The Overlooked .25 Caliber Cartridges by Chuck Hawks