.17 HM2

Rimfire cartridge .17 Hornady Mach 2 Rimfire 17 Family.jpg 200px Left: .17 HM2, Right: .17 HMR United States Rifle Hornady 2004 CCI/Hornady/Eley 2004–present .22 LR Stinger Rimmed, bottleneck .172 .168 .180 .226 .226 .275 .043 .714 1.00 Rimfire 24000 17 V-Max 2100 166 Hornady Hornady The .17 Hornady Mach 2, commonly known as the .17 HM2, is a rimfire cartridge introduced in 2004 by the ammunition manufacturer Hornady, following the successful launch in 2002 of the .17 HMR. The .17 HM2 is based on the .22 Long Rifle "Stinger" case, necked down to .17 caliber (4.5 mm) and using a bullet weighing less than half the weight of a typical .22 Long Rifle bullet. Performance The weight of the bullet is a key part of achieving a very high velocity for a rimfire round. It weighs only 17 grains (1.10 g) vs 30-40 grains (1.94-2.59 g) of a typical .22 LR bullet.GunData The .17 HM2 may or may not live up to its "Mach 2" name, depending on geographic location and conditions, with velocities out of a rifle of 2,100 ft/s (640 m/s).ChHa The velocity is nearly double that of a standard .22 LR, which results in a much flatter trajectory out to its 175-yard (160 m) effective range.ShTim Converting rifles thumb|left|100px|Left: .17HM2, right: .22 LR Since the .17 HM2 is based on the .22 LR, converting most bolt action firearms chambered in .22 LR to .17 HM2 requires only a barrel change. The higher chamber pressure makes conversion of semi-automatic firearms more difficult, as virtually all are blowback designs that are sensitive to pressure changes. Conversion kits have appeared, and they replace the factory bolt or bolt handle with a heavier one to increase the bolt mass and compensate for the higher chamber pressure.ShTim See also .17 PMC/Aguila List of handgun cartridges List of rifle cartridges List of rimfire cartridges Table of handgun and rifle cartridges 4 mm caliber References 30em https://www.hornady.com/ammunition/rimfire/17-mach-2-17-gr-v-max-varmint-express-rimfire#!/ 17 Mach 2 17 gr V-MAX Varmint Express Rimfire hornady.com August 8, 2018 live https://web.archive.org/web/20180808015745/https://www.hornady.com/ammunition/rimfire/17-mach-2-17-gr-v-max-varmint-express-rimfire#!/ August 8, 2018 http://www.chuckhawks.com/17_M2.htm Hornady's .17 Mach 2 Hawks Chuck chuckhawks.com August 8, 2018 live https://web.archive.org/web/20180723182510/https://www.chuckhawks.com/17_M2.htm July 23, 2018 http://gundata.org/cartridge/166/.17-mach-2/ .17 Mach 2 Ballistics August 6, 2018 live https://web.archive.org/web/20180806103927/http://gundata.org/cartridge/166/.17-mach-2/ August 6, 2018 http://www.shootingtimes.com/ammo/ammunition_st_17lr_200803/ The Ultimate Flyweight Match: .17 HM2 Vs. .22 LR Simpson Layne January 4, 2011 shootingtimes.com August 5, 2018 live https://web.archive.org/web/20180805021645/http://www.shootingtimes.com/ammo/ammunition_st_17lr_200803/ August 5, 2018 Further reading https://www.chuckhawks.com/17_M2.htm Hornady's .17 Mach 2 chuckhawks.com Chuck Hawks External links Eley CCI Category:Pistol and rifle cartridges Category:Rimfire cartridges Category:Weapons and ammunition introduced in 2004