| .17 HMR | ||
|---|---|---|
 20-grain (1.3 g) hollow-point .17 HMR rounds |
||
| Type | Rifle | |
| Place of origin |  United States |
|
| Production history | ||
| Designer | Hornady | |
| Designed | 2002 | |
| 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 (1.1 g) | 2,550 ft/s (780 m/s) | 245 ft·lbf (332 J) |
| 20 gr (1.3 g) | 2,350 ft/s (720 m/s) | 250 ft·lbf (340 J) |
| Source(s): Hornady [1] | ||
.17 Hornady Magnum Rimfire, 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, and it is more costly to shoot than traditional .22 caliber rimfire cartridges. Commonly loaded with a 17 grain (1.1 g) bullet, it can deliver muzzle velocities in excess of 2550 ft/s (775 m/s).[2]
Contents |
Development [link]
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.[3] 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.[4]
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.[2]
Availability [link]
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.[5] 17 HMR rifles and ammo have continued to sell briskly.
Following the success of the .17 HMR, the .17 Hornady Mach 2 (.17 HM2), 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 casing 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.
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.[6] 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.[7][8]
Comparison with .22 LR Ammunition [link]
Advantages [link]
- Faster flight: 2350-2550fps compared to the popular ≈1255fps .22LR High Velocity. (.22LR Hyper Velocity can reach ≈1700fps)
- Flatter trajectory. This means that the user will not have to adjust for the projectile's drop as much as with the .22 LR
- Longer range
- As the round is smaller there is less chance of ricochet
- More accurate, 1 MOA or better
- More powerful
- Less susceptible to cross winds due to high ballistic co-efficient
Disadvantages [link]
- Much more expensive
- Too powerful at close distance for small game, although soft point bullets are available
- The cartridge is louder and there are no subsonic bullets available
Comparison with .22 WMR Ammunition [link]
Advantages [link]
- Faster flight: 2350-2550fps compared to the 1910fps 22Wmr 40gr rounds
- Flatter trajectory and better ballistic co-efficient
- Longer range. Bullets expand better especially at long range e.g. 150 yards
- As the round is smaller there is less chance of ricochet
- More accurate, 1 MOA or better
- Less susceptible to cross winds due to high ballistic co-efficient
Disadvantages [link]
- Less kinetic energy
See also [link]
References [link]
- ^ "Hornady .17 HMR Page". Archived from the original on 2007-09-27. https://web.archive.org/web/20070927043441/https://www.hornady.com/shop/?ps_session=67ba2e47a1f85014c95fee25b93d5727&page=shop/browse&category_id=e4c1104b0d6d112d2b80155f75b83ff2. Retrieved 2007-09-25.
- ^ a b "The .17 Hornady Magnum Rimfire". Archived from the original on 29 September 2007. https://web.archive.org/web/20070929091524/https://www.chuckhawks.com/17HMR.htm. Retrieved 2007-09-25.
- ^ "Magnum Rimfire Comparison: .17 HMR, 5mm Rem. RF Mag, and .22 WMR". Archived from the original on 29 September 2007. https://web.archive.org/web/20070929091721/https://www.chuckhawks.com/magnum_rimfire_comparison.htm. Retrieved 2007-09-25.
- ^ Centurion resumed manufacture of 5 mm RMR in 2007.
- ^ The Borchardt Rifle Corp. sells parts to convert Ruger revolvers to .17 HMR.
- ^ "Ammo Roundup: .17 HMR". Archived from the original on 2009-09-16. https://www.chuckhawks.com/ammo_roundup_17HMR.htm. Retrieved 2007-09-25.
- ^ ".17 HMR Semi-Auto Firearm Safety Issues". https://www.americanrifleman.org/ArticlePage.aspx?id=1927&cid=6. Retrieved 2009-11-21.
- ^ "Safety Warning And Recall Notice". Archived from the original on 12 February 2010. https://web.archive.org/web/20100212054021/https://www.remington.com/pages/news-and-resources/safety-center/safety-warning-recall-notice.aspx. Retrieved 2010-02-06.
External links [link]
- Varmint Al's Field Testing the .17 HMR
https://wn.com/.17_HMR
VMM-774
Marine Medium Tiltrotor Squadron 774 (VMM-774) is a United States Marine Corps medium helicopter squadron consisting of V-22 Osprey transport helicopters. The squadron, known as the "Wild Goose", is a United States Marine Corps Reserve unit based at Naval Station Norfolk (Chambers Field), Virginia and falls under the command of Marine Aircraft Group 49 (MAG-49) and the 4th Marine Aircraft Wing (4th MAW).
With the deactivation of training squadron HMMT-164 and re-designation as VMM-164 on April 9, 2015, HMM-774 was the last dedicated CH-46E squadron in the Marine Corps.
Mission
Support the MAGTF Commander by providing assault support transport of combat troops, supplies, and equipment, day or night, under all weather conditions during expeditionary, joint or combined operations
Maintain combat readiness and provide support to the 4th Marine Aircraft Wing. Missions include assault support, CASEVAC, helicopter support team training and SEAL team support.
History
Marine Medium Helicopter 774 was activated September 5, 1958, at Naval Air Station New York as Marine Transport Helicopter Squadron 774 (HMR-774). The squadron operated the SH-34G/J Sea Bat helicopter. In April 1962 the squadron was redesignated Marine Medium Helicopter Squadron 774, but was deactivated on 30 September 1962.
VMM-163
Marine Medium Tiltrotor Squadron 163 (VMM-163) is a United States Marine Corps helicopter squadron consisting of MV-22 Osprey transport tiltrotors. The squadron, known as the "Ridge Runners", is based at Marine Corps Air Station Miramar, California and falls under the command of Marine Aircraft Group 16 (MAG-16) and the 3rd Marine Aircraft Wing (3rd MAW).
The Squadron's nickname, "Ridge Runners", was bestowed as a result of typhoon rescue and relief operations in the mountainous terrain surrounding Hagman, Japan.
Mission
Provide assault support transport of combat troops, supplies and equipment during expeditionary, joint or combined operations. Be prepared for short-notice, worldwide deployment in support of Marine Air-Ground Task Force operations.
History
Vietnam War
HMR(L)-163, the predecessor of HMM-163, was formed in December 1951. From February to October 1965, the HMM-163 "Ridge Runners" helicopter squadron became famous for its operations in Viet Nam. This was primarily due to a LIFE magazine story that documented the combat death of Marine H-34 pilot 1st Lt James E. Magel and the rescue of wounded and paralyzed 1st Lt Dale Eddy during a strike mission transporting South Vietnamese troops. For most U.S. citizens, this was the first time they were made aware of the extent of America's involvement in Viet Nam.
VMM-764
Marine Medium Tiltrotor Squadron 764 (VMM-764) is a United States Marine Corps Reserve squadron consisting of MV-22B Ospreys. The squadron, known as "Moonlight," is based at Marine Corps Air Station Miramar in San Diego, CA and falls under the command of Marine Aircraft Group 41 (MAG-41) and the 4th Marine Aircraft Wing (4th MAW).
History
VMM-261
Marine Medium Tiltrotor Squadron 261 (VMM-261) is a United States Marine Corps tiltrotor squadron consisting of MV-22 Osprey transport aircraft. The squadron, known as the "Raging Bulls", is based at Marine Corps Air Station (MCAS) New River, North Carolina and typically falls under the command of Marine Aircraft Group 26 (MAG-26) and the 2nd Marine Aircraft Wing (2nd MAW). They are the fourth squadron in the Marine Corps to transition to the MV-22 Osprey.
Mission
Provide assault support of combat troops, supplies and equipment during amphibious operations and subsequent operations ashore. Routinely, VMM squadrons provide the foundation for an aviation combat element (ACE) of any level Marine Air-Ground Task Force (MAGTF) mission that may include conventional assault support tasks and special operations.
History
Early years
Marine Helicopter Transport Squadron 261 (HMR-261) was activated on April 5, 1951 at Marine Corps Air Station Cherry Point, North Carolina. From 1951 through 1956, HMR-261 carried the tail code of "HM." Since then, it has carried the tail code of "EM" on its helicopters.
VMM-263
Marine Medium Tiltrotor Squadron 263 (VMM-263) is a United States Marine Corps tiltrotor squadron consisting of MV-22B Osprey transport aircraft. The squadron, known as the "Thunder Eagles", is based at Marine Corps Air Station New River, North Carolina and falls under the command of Marine Aircraft Group 26 (MAG-26) and the 2nd Marine Aircraft Wing (2nd MAW).
Early years
Marine Medium Tiltrotor Squadron 263 was activated initially as Marine Helicopter Transport Squadron (HMR-263) on June 16, 1952 and was outfitted with Sikorsky HRS helicopters. For its first two years of operations the squadron was based at Marine Corps Air Station Cherry Point, North Carolina. During these early months the squadron was occupied in proficiency training, which contributed to the growing body of knowledge of rotary wing aircraft and their employment and ultimately became the basis for the doctrine of vertical envelopment then being developed by the Marine Corps.
On July 7, 1954, HMR-263 relocated to Marine Corps Air Facility New River, North Carolina, where it remained home based for the next eleven years. During this time the squadron participated in over fifteen major exercises and deployments including disaster relief in Tampico, Mexico in October 1955 and operations from the submarine USS Sea Lion in March 1956. During December 1956 the squadron was redesignated HMR(L)-263. Six Caribbean deployments and numerous local training exercises ensued. During February 1962, the squadron was reequipped with the HUS-1 (UH-34) helicopter. In October 1962, HMM-263 was deployed to the Caribbean when the United States initiated a large-scale response to the Soviet Union’s deployment of intercontinental ballistic missiles to Cuba. In June 1964, the squadron was a participant in Exercise Steel Pike off the coast of Spain, then the largest amphibious exercise since World War II.
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