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The .17 Hornady Magnum Rimfire, commonly known as the .17 HMR, is a rimfire rifle cartridge developed by Littleman in 2002. It was developed by necking down a .22 Magnum case to take a .17 caliber (4.5 mm) projectile.
The .17 Hornady Magnum Rimfire (HMR) is the most recent development in rimfire cartridges. An excellent choice for long-range varmint hunting and casual plinking, the advantage of the .17 HMR is that it maintains a very flat trajectory – resulting in an extremely accurate cartridge. To know more read our comprehensive guide about : 17 HMR buying guide.
About: .17 HMR
- Type: Rimfire
- Place of origin: United States
- Designer: Hornady
- Designed: 2002
- Manufacturer: CCI, Federal, Hornady, PMC,[1] Remington, Winchester
- Produced: 2002–present
Specifications
- Parent case: .22 WMR
- Bullet diameter: .172 in (4.4 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
Ballistic performance
| Bullet mass/type | Velocity | Energy |
|---|---|---|
| 17 gr. (1.1 g) | 2,650 ft/s (810 m/s)245 | ft&sdot lbf (332 J) |
| 20 gr. (1.3 g) 2,350 ft/s | (720 m/s)250 | ft⋅ lbf (340 J) |
