.17 Winchester Super Magnum

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17 Winchester Super Magnum
Type Rifle
Place of origin United States
Production history
Designer Winchester
Designed 2012
Produced 2013–Present
Parent case .27 caliber nail gun blank
Bullet diameter .172 in (4.4 mm)
Case length 1.200 in (30.5 mm)
Primer type Rimfire
Ballistic performance
Bullet weight/type Velocity Energy
20 gr (1 g) 3,000 ft/s (910 m/s) 399 ft·lbf (541 J)
25 gr (2 g) 2,600 ft/s (790 m/s) 375 ft·lbf (508 J)

.17 Winchester Super Magnum, is a rimfire rifle cartridge developed by the ammunition company Winchester in 2012. It descended from the .27 caliber nail gun blank by necking down the blank case to take a .17 caliber (4.5 mm) bullet. Initial loadings will be a 20 grain bullet, delivering muzzle velocities around 3000 ft/s .[1]


Winchester, in conjunction with Savage, introduced this cartridge at the 2013 SHOT Show. [2]

The brass case for this round is roughly 50% thicker than the 17 HMR, and the max average internal pressure is 33,000 psi, versus the 17 HMR's 26,000 psi. [3]

Factory ammunition[edit]

Currently available is the Winchester Varmint High Velocity Ammunition 17 Winchester Super Magnum in either the 20 & 25 Grain Box of 50. The cartridge at 20 grain = 3000 fps and 25 grain = 2,600 fps.


Currently, rifles firing the 17 WSM are the Savage B-Mag bolt action, Ruger Model 77/17, Winchester 1885 Low Wall single shot, the Volquartsen semi-automatic, H-S Precision Pro Series 2000, and the semi-automatic Franklin Armory F-17. The F-17 is the first gas-operated rimfire firearm, designed to handle the higher pressures of this cartridge. [4]

See also[edit]


External links[edit]