.17 Winchester Super Magnum
.17 Winchester Super Magnum, commonly known as the .17 WSM, is a rimfire rifle cartridge developed by the ammunition company Winchester in 2012. It descended from a .27 caliber nail-gun blank cartridge by necking down the blank case to take a .17 caliber (4.5mm) bullet. Initial loadings were with a 20 grains (1.3 g) bullet, delivering muzzle velocities around 3,000-foot-per-second (910 m/s).
| 17 Winchester Super Magnum | ||||||||||||
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.17 WSM (left), with .17 Hornet (center) and .22 Hornet (right) | ||||||||||||
| Type | Rifle | |||||||||||
| Place of origin | United States | |||||||||||
| Production history | ||||||||||||
| Designer | Winchester | |||||||||||
| Designed | 2012 | |||||||||||
| Produced | 2013–present | |||||||||||
| Specifications | ||||||||||||
| Parent case | .27 caliber nail gun blank cartridge | |||||||||||
| Case type | Rimmed, bottleneck | |||||||||||
| Bullet diameter | .172 in (4.4 mm) | |||||||||||
| Neck diameter | .197 in (5.0 mm) | |||||||||||
| Shoulder diameter | .269 in (6.8 mm) | |||||||||||
| Base diameter | .269 in (6.8 mm) | |||||||||||
| Rim diameter | .333 in (8.5 mm) | |||||||||||
| Rim thickness | .066 in (1.7 mm) | |||||||||||
| Case length | 1.200 in (30.5 mm) | |||||||||||
| Overall length | 1.440 in (36.58 mm) to 1.590 in (40.39 mm) | |||||||||||
| Primer type | Rimfire | |||||||||||
| Maximum pressure | 33,000 psi (230 MPa) | |||||||||||
| Ballistic performance | ||||||||||||
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