.17 HMR
.17 Hornady Magnum Rimfire, commonly known as the .17 HMR, is a rimfire rifle cartridge developed by Hornady in 2002. It was developed by necking down a .22 Winchester Magnum Rimfire case to take a .17 caliber (4.5 mm) projectile. Commonly loaded with a 17 grain (1.1 g) projectile, it can deliver muzzle velocities in excess of 775 m/s (2,650 ft/s).
| .17 HMR | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
17-grain (1.1 g) A Sellier and Bellot .17 HMR round with a light green plastic tip. | ||||||||||||
| Type | Rifle | |||||||||||
| Place of origin | United States | |||||||||||
| Production history | ||||||||||||
| Designer | Hornady | |||||||||||
| Designed | 2002 | |||||||||||
| Manufacturer | CCI, Federal, Hornady, PMC, Remington, Winchester | |||||||||||
| Produced | 2002–present | |||||||||||
| Specifications | ||||||||||||
| Parent case | .22 WMR | |||||||||||
| Case type | Rimmed, bottleneck | |||||||||||
| Bullet diameter | .172 in (4.4 mm) | |||||||||||
| Land diameter | .168 in (4.3 mm) | |||||||||||
| Neck diameter | .190 in (4.8 mm) | |||||||||||
| Shoulder diameter | .238 in (6.0 mm) | |||||||||||
| Base diameter | .238 in (6.0 mm) | |||||||||||
| Rim diameter | .286 in (7.3 mm) | |||||||||||
| Rim thickness | .05 in (1.3 mm) | |||||||||||
| Case length | 1.058 in (26.9 mm) | |||||||||||
| Overall length | 1.349 in (34.3 mm) | |||||||||||
| Primer type | Rimfire | |||||||||||
| Maximum pressure | 26,000 psi (180 MPa) | |||||||||||
| Ballistic performance | ||||||||||||
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| Source(s): Hornady | ||||||||||||
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