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.25 WSSM
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25 WSSM cartridges loaded for an AR-15 magazine. For comparison, a 2 3/4" shotgun shell & 5.56mm NATO cartridge are included
Type Rifle
Place of origin USA
Production history
Designer Browning / Winchester
Manufacturer Winchester
Produced 2004
Specifications
Parent case .300 WSM
Bullet diameter .257 in (Bad rounding hereScript error mm)
Neck diameter .305 in (Bad rounding hereScript error mm)
Shoulder diameter .544 in (Bad rounding hereScript error mm)
Base diameter .555 in (Bad rounding hereScript error mm)
Rim diameter .535 in (Bad rounding hereScript error mm)
Rim thickness .054 in (Bad rounding hereScript error mm)
Case length 1.670 in (Bad rounding hereScript error mm)
Overall length 2.36 in (Bad rounding hereScript error mm)
Primer type large rifle
Ballistic performance
Bullet weight/type Velocity Energy
75 gr (Bad rounding hereScript error g) VMax3,775 ft/s (Bad rounding hereScript error m/s)2,374 ft·lbf (Bad rounding hereScript error J)
85 gr (Bad rounding hereScript error g) BT3,547 ft/s (Bad rounding hereScript error m/s)2,375 ft·lbf (Bad rounding hereScript error J)
100 gr (Bad rounding hereScript error g) BT3,264 ft/s (Bad rounding hereScript error m/s)2,366 ft·lbf (Bad rounding hereScript error J)
115 gr (Bad rounding hereScript error g) BT2,999 ft/s (Bad rounding hereScript error m/s)2,297 ft·lbf (Bad rounding hereScript error J)
120 gr (Bad rounding hereScript error g) SP2,985 ft/s (Bad rounding hereScript error m/s)2,375 ft·lbf (Bad rounding hereScript 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,[1] 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.[2]

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.[3]

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.[4] 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.[5]

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