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.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 (4.5mm) 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).




Development



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 Rimfire Magnum, which was made from 1970 to 1974, and was to that point the fastest rimfire cartridge ever produced. With 5 mm diameter barrels and bullets being virtually unavailable at the time (the 5mm RMR was the last commercial 5 mm 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 the 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, the .22 Long Rifle. The .17 caliber wildcats not only met but far exceeded the 5mm 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 5 mm rimfire for wildcatters.
Hornady, in conjunction with Marlin Firearms and Sturm, Ruger & Co. (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



Cartridges for .17 HMR come with bullets that weigh 15.5 grains (1.00 g), 17 grains (1.1 g), and 20 grains (1.3 g), and come in designs such as plastic-tipped bullets, hollow points, soft points, and FMJs. 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 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.
Examples of bolt-action or lever-action rifles that are chambered for (or have variants chambered for) .17 HMR include Armscor M1700, Browning T-Bolt, CZ 452, Henry Golden Boy, Ruger Model 96, Sako Quad, Savage 93, Steyr Zephyr II, Marlin 917 and Weihrauch 60J.
Citing safety concerns about the round's use in semi-automatic firearms, Remington issued a product safety warning and recall notice.




.17 Hornady Mach 2



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 shorter in case length) 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






External links



Varmint Al's Field Testing the .17 HMR
The Hornady Podcast conversation with Steve Hornady, Hornady Director of Engineering, Mitch Mittelstaedt and Hornady Senior Ballistics Scientist, Dave Emary.

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• Heritage Rough Rider Single Action .17 HMR - The Firearms Forum
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Heritage Rough Rider Single Action .17 HMR - The Firearms Forum

Mar 8, 2003 · Reply Heritage Rough Rider Single Action .17 HMR-----Posted the following in General...may be better here. I searched for the 17 in this forum, read them all. Comments were on rifles, but didn;t see any single action pistols mentioned, so... Spotted the above mentioned pistola at the gun shop yesterday.

which is better .17 hmr or .17 mach 2 | The Firearms Forum

Apr 13, 2007 · The .17 Mach 2, as mentioned, is slower than the HMR, but shares the same bullet; stuff this bullet into a small centerfire case, like the .17 'Ackley Improved' Hornet, and now, you have something! I have killed, deader than stone, a …

.17 HMR Neck Splits??? - The Firearms Forum

Jan 5, 2015 · About a year ago I bought a savage 93r 17 from the local Walmart. It is the pre 'accu-trigger' model. Only paid $200.00 for it. Was having really bad problems with accuracy and examined scope, scope mounts, etc. Even tried a different scope which I know is perfect. Then I noticed that about half of all my .17 hmr necks are split.

17hmr max range - The Firearms Forum

Dec 24, 2007 · Then i shot it with a .17 hmr hornady and it punctured right through it at 50 yards Heres a site that is all about the 17hmr you should check it out when ya have some time he tests it by shooting a variety of penetration tests, the graghs shown above and alot more, as well as all the information you can think of and then some. killing ground ...

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Jan 8, 2021 · I've had this .17 hmr for years, never shot it because of the extractor I assume or maybe a barrel problem. Majority of the time either extractor won't grab or the shell is stuck whether it's spent or ready to be fired. Just searching for solution, tips and any help I can get

Taurus .17HRM Pump Action M172C-SS - The Firearms Forum

Apr 20, 2005 · In 17HMR, that is a different question. The ammo is very expensive. Even if it was available in 17 HM2, that ammo is also expensive, but less so. I think the value of this pump gun is in 22 LR as it should be able to shoot $.99 cent a box ammo and $12 a box ammo., but you get to choose, unlike either of the 17's.

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Aug 16, 2005 · The bitch of it all is that there is no "match quality" ammo available, for the .17 HMR, so all accuracy is going to be biased on ammo quality, and on how well today's bullets fit your chamber; In the centerfire world, and in the .22rf world, any accuracy 'smith has the availability of multiple chamber reamers to insure the concentric ...

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Aug 20, 2009 · If you have a laminate stock Remington Model 597 17 HMR semi-automatic rifle, Remington will provide you a coupon valued at $250.00 good for the purchase of a replacement Remington firearm. Remington will also reimburse you for the actual postage to return your Model 597 17 HMR semi-automatic rifle to Remington. Please allow up to 6 weeks after ...

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Jul 2, 2021 · I wanted a future .17 HMR suppressor host since I really like the caliber. I didn't have a threaded .17 HMR already and the aggravation of having an existing barrel threaded just turned me off. So, I did some research and narrowed it down to a Savage FV-SR variant in either the 93 or B series or a Ruger Precision Rimfire.

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Jun 1, 2004 · The problem with any of the rimfire cartridges like the 22 MAG or the 17 HMR is the ammo costs. Something like the 204 Ruger can be reloaded greatly reducing the cost to fire it. But a new cartridge, also by Hornady-17HM2 is based on the 22 LR Hyper Velocity rimfire cases and is touted as being priced for ammo between 22LR and 22 MAG.