.17 HMR

.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,[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)
Case length 1.058 in (26.9 mm)
Overall length 1.349 in (34.3 mm)
Primer type Rimfire
Ballistic performance
Bullet weight/type Velocity Energy
17 gr (1 g) 2,550 ft/s (780 m/s) 245 ft·lbf (332 J)
20 gr (1 g) 2,350 ft/s (720 m/s) 250 ft·lbf (340 J)
Source(s): Hornady [2]

.17 Hornady Magnum Rimfire (4.5×27mmR), commonly known as the .17 HMR, is a rimfire rifle cartridge developed by the ammunition company Hornady in 2002. It descended from the .22 Magnum by necking down the .22 Magnum case to take a .17 caliber (4.5 mm) bullet. Commonly loaded with a 17 grain (1.1 g) bullet, it can deliver muzzle velocities in excess of 775 m/s (2550 ft/s).[3]

Development

Left: 17 HMR,
Right: 22 WMR

The .17 HMR round is similar to rounds developed by dedicated rimfire wildcatters who worked to create a rimfire cartridge with an exceptionally flat trajectory. These wildcatters were seeking to match the ballistics of the obsolete 5mm Remington Magnum Rimfire, which was made from 1970 to 1974, and was to that point the fastest rimfire cartridge ever produced.[4] With 5mm (.20 caliber) diameter barrels and bullets being virtually unavailable at the time (the 5mm RMR was the last commercial 5mm round until the 2004 release of the centerfire .204 Ruger), the commercially available .17 caliber became their bullet of choice. The .22 Winchester Magnum Rimfire was the logical parent case, rather than 5mm RMR (with its unique case head size, which requires a significantly different bolt and magazine), because it was commonly available, and it is a far larger and stronger case than the next largest .22 Long Rifle. The .17 caliber wildcats not only met, but far exceeded the 5 mm RMR's velocities and flat trajectory. The accuracy of these cartridges was also quite good. However, the downrange energy of the 5mm RMR is superior to both .22 WMR and .17 HMR, so there is still potential in the 5mm rimfire for wildcatters.[5]

Hornady, in conjunction with Marlin Firearms and Sturm, Ruger (manufacturers in the rimfire rifle market), followed much the same path. With the .22 WMR case as the starting point, a simple barrel change was sufficient for most .22 WMR firearms to chamber the new cartridge. In 2002 the first rifles and ammunition began appearing on the market. While the ammunition was relatively expensive due to the high-performance .17 caliber bullets used, it was still cheaper than most centerfire ammunition. By 2004 CCI, Federal Cartridge and Remington had each introduced .17 HMR ammunition offerings.[3]

Availability

A .17 HMR round with a ballistic tip (left) compared with a .22 Long Rifle round (right)

Cartridges for .17 HMR come with bullets that weigh 15.5-grain (1.00 g), 17-grain (1.1 g), and 20-grain (1.3 g), and come in designs such as polymer (ballistic) tipped, hollow points, soft points, and FMJ. The terminal ballistics of the lightweight expanding bullets limit the .17 HMR to small game animals and varmints. .17 HMR ammunition is less common and more expensive than the .22 caliber rimfire rounds, but this is changing as the popularity of .17 HMR rifles gathers momentum.[6]

A case of .17 HMR rounds with hollow points.

A growing number of companies offer .17 HMR ammunition. CCI Ammunition loads all of the .17 HMR ammunition for the CCI, Federal Cartridge, Hornady, and Remington brands. However, the ammunition is loaded with different bullets to different specifications.[7] Ammunition is also available from Winchester, PMC and Sellier & Bellot.

Citing safety concerns about the round's use in semi-automatic firearms, Remington issued a product safety warning and recall notice.[8][9]

Comparison with .22 LR ammunition

Advantages

Disadvantages

Comparison with .22 WMR ammunition

Advantages

Disadvantages

.17 Hornady Mach 2

Main article: .17 HM2

Following the success of the .17 HMR, the .17 Hornady Mach 2 was introduced in early 2004. The .17 HM2 is based on the .22 LR (slightly longer in case dimensions) case necked down to .17 caliber using the same bullet as the HMR but at a velocity of approximately 2,100 feet per second (640 m/s) in the 17-grain (1.1 g) polymer tip loading.

See also

References

  1. ↑ PMC ammunition site
  2. ↑ "Hornady .17 HMR Page". Archived from the original on 2007-09-27. Retrieved 2007-09-25.
  3. 1 2 "The .17 Hornady Magnum Rimfire". Archived from the original on 29 September 2007. Retrieved 2007-09-25.
  4. ↑ "Magnum Rimfire Comparison: .17 HMR, 5mm Rem. RF Mag, and .22 WMR". Archived from the original on 29 September 2007. Retrieved 2007-09-25.
  5. ↑ Centurion resumed manufacture of 5 mm RMR in 2007.
  6. ↑ The Borchardt Rifle Corp. sells parts to convert Ruger revolvers to .17 HMR.
  7. ↑ "Ammo Roundup: .17 HMR". Archived from the original on 2009-09-16. Retrieved 2007-09-25.
  8. ↑ ".17 HMR Semi-Auto Firearm Safety Issues". Retrieved 2009-11-21.
  9. ↑ "Safety Warning And Recall Notice". Archived from the original on 12 February 2010. Retrieved 2010-02-06.

External links

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