The.17 HMR round is similar to rounds developed by dedicated rimfirewildcatters who worked to create a rimfire cartridge with an exceptionally flat trajectory. These wildcatters were seeking to match the ballistics of the obsolete 5 mm 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 commercially available.17 caliber became their bullet of choice. The.22 Winchester Magnum Rimfire was the logical parent case, rather than 5mm RMR, because it was commonly available, and it is a far larger and stronger case than the next largest, the.22 LongRifle. 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 5mm rimfire for wildcatters. Hornady, in conjunction with Marlin Firearms and Sturm, Ruger, 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,, and, 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. Citing safety concerns about the round's use in semi-automatic firearms, Remington issued a product safety warning and recall notice.
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 case necked down to.17 caliber using the same bullet as the HMR but at a velocity of approximately in the polymer tip loading.
