. 17 HMR - wikipedia. 17 HMR Jump to : navigation, search. 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 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 mass / 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. 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 ) projectile. Commonly loaded with a 17 grain ( 1.1 g ) projectile, it can deliver muzzle velocities in excess of 775 m / s ( 2550 ft / s ). Contents 1 Development 2 Availability 3 Comparison with. 22 LR ammunition 3.1 Advantages 3.2 Disadvantages 4 Comparison with. 22 WMR ammunition 4.1 Advantages 4.2 Disadvantages 5. 17 Hornady Mach 2 6 See also 7 References 8 External links 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. 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. 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. 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. 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. 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. Comparison with. 22 LR ammunition Advantages Higher velocity : 2350 - 2550fps compared to the popular ≈ 1255fps. 22LR High Velocity. (. 22LR Hyper Velocity can reach ≈ 1700fps ) Flatter trajectory Longer range As the round is faster there is less chance of ricochet due to bullet ' break up ' at shorter ranges Disadvantages More expensive. Overly destructive at close range for small game. The cartridge is appreciably louder. Increased tendency to foul barrel. Comparison with. 22 WMR ammunition Advantages Faster flight : 2350 - 2550fps compared to the Hornady 2200fps 22Wmr 30gr rounds Flatter trajectory Longer range. Bullets expand better especially at longer ranges e.g. 150 yards As the round is faster there is less chance of ricochet due to bullet ' break up ' at shorter ranges Disadvantages Less kinetic energy Increased tendency to foul barrel. 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 4 mm caliber Table of handgun and rifle cartridges 4.5 × 26mm MKR References Jump up ^ PMC ammunition site Jump up ^ `` Hornady. 17 HMR Page ''. Archived from the original on 2007 - 09 - 27. Retrieved 2007 - 09 - 25. ^ Jump up to : `` The. 17 Hornady Magnum Rimfire ''. Archived from the original on 29 September 2007. Retrieved 2007 - 09 - 25. Jump up ^ `` Magnum Rimfire Comparison :. 17 HMR, 5mm Rem. RF Mag, and. 22 WMR ''. Archived from the original on 29 September 2007. Retrieved 2007 - 09 - 25. Jump up ^ Centurion resumed manufacture of 5 mm RMR in 2007. Jump up ^ The Borchardt Rifle Corp. sells parts to convert Ruger revolvers to. 17 HMR. Jump up ^ `` Ammo Roundup :. 17 HMR ''. Archived from the original on 2009 - 09 - 16. Retrieved 2007 - 09 - 25. Jump up ^ ``. 17 HMR Semi-Auto Firearm Safety Issues ''. Retrieved 2009 - 11 - 21. Jump up ^ `` Safety Warning And Recall Notice ''. Archived from the original on 12 February 2010. Retrieved 2010 - 02 - 06. External links Wikimedia Commons has media related to. 17 HMR. Varmint Al 's Field Testing the. 17 HMR Cartridges with bullet diameter between 4 millimetres ( 0.16 in ) and 5 millimetres ( 0.20 in ) Rimfire cartridges. 17 Mach 2. 17 HMR. 17 PMC / Aguila. 17 Winchester Super Magnum 4.5 × 26mm MKR 4mm M20 Centerfire cartridges Pistol and PDW cartridges 4.25 mm Liliput 4.38 × 30mm Libra 4.5 × 40mmR 4.6 × 30mm HK Revolver cartridges. 17 Bumble Bee Rifle cartridges. 17 Hornet. 17 Mach IV. 17 Remington. 17 Remington Fireball. 17 Ackley Bee 4.85 × 49mm Retrieved from `` https://en.wikipedia.org/w/index.php?title=.17_HMR&oldid=796477532 '' Categories : Pistol and rifle cartridges Rimfire cartridges Talk Contents About Wikipedia Čeština Deutsch Français Norsk Polski Русский Slovenčina Türkçe Українська Edit links This page was last edited on 21 August 2017, at 03 : 14. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. 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Question: what does the hmr stand for in .17hmr
Answer: Hornady Magnum Rimfire