.25 WSSM

colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"

| .25 WSSM colspan="3" style="text-align: center; font-size: 90%; border-bottom: 1px solid #aaa; line-height: 1.25em;"

| File:25 WSSM cartridge comparison AR-15.jpg
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 colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"

| Production history Designer Browning / Winchester Manufacturer Winchester Produced 2004 colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"

| Specifications Parent case .300 WSM Bullet diameter .257 in (

 mm

)

Neck diameter .305 in (

 mm

)

Shoulder diameter .544 in (

 mm

)

Base diameter .555 in (

 mm

)

Rim diameter .535 in (

 mm

)

Rim thickness .054 in (

 mm

)

Case length 1.670 in (

 mm

)

Overall length 2.36 in (

 mm

)

Primer type large rifle colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"

| Ballistic performance Bullet weight/type Velocity Energy style="vertical-align:middle; border-bottom: 1px dotted #aaa;

" | 75 gr (

 g)

VMax||style="border-bottom: 1px dotted #aaa;

"|3,775 ft/s (

 m/s)

||style="border-bottom: 1px dotted #aaa;

"|2,374 ft·lbf (

 J)

style="vertical-align:middle; border-bottom: 1px dotted #aaa;

" | 85 gr (

 g)

BT||style="border-bottom: 1px dotted #aaa;

"|3,547 ft/s (

 m/s)

||style="border-bottom: 1px dotted #aaa;

"|2,375 ft·lbf (

 J)

style="vertical-align:middle; border-bottom: 1px dotted #aaa;

" | 100 gr (

 g)

BT||style="border-bottom: 1px dotted #aaa;

"|3,264 ft/s (

 m/s)

||style="border-bottom: 1px dotted #aaa;

"|2,366 ft·lbf (

 J)

style="vertical-align:middle; border-bottom: 1px dotted #aaa;

" | 115 gr (

 g)

BT||style="border-bottom: 1px dotted #aaa;

"|2,999 ft/s (

 m/s)

||style="border-bottom: 1px dotted #aaa;

"|2,297 ft·lbf (

 J)

style="vertical-align:middle; border-bottom: 1px dotted #aaa;

" | 120 gr (

 g)

SP||style="border-bottom: 1px dotted #aaa;

"|2,985 ft/s (

 m/s)

||style="border-bottom: 1px dotted #aaa;

"|2,375 ft·lbf (

 J)

Source: 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 almost exactly between the .257 Roberts and the .25-06 Remington, making it well suited for medium to large game. Performance is far less than other .25 caliber magnum rounds as 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.

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Cartridge:rifles