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.17 HM2

Rimfire cartridge

.17 HM2

Rimfire cartridge

FieldValue
name.17 Hornady Mach 2
imageRimfire 17 Family.jpgimage_size = 200px
captionLeft: .17 HM2, Right: [.17 HMR](17-hmr)
originUnited States
typeRifle
designerHornady
design_date2004
manufacturerCCI/Hornady/Eley
production_date2004–present
parent.22 Long Rifle Stinger
case_typeRimmed, bottleneck
bullet.172
land.168
neck.180
shoulder.226
base.226
rim_dia.275
rim_thick.043
case_length.714
length1.00
primerRimfire
max_pressure24000
bw117
btype1V-Max
vel12100
en1166
balsrcHornady

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. 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). 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.

Converting rifles

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 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 pressure.

References

References

  1. "17 Mach 2 17 gr V-MAX Varmint Express Rimfire".
  2. Hawks, Chuck. "Hornady's .17 Mach 2".
  3. ".17 Mach 2 Ballistics".
  4. Simpson, Layne. (January 4, 2011). "The Ultimate Flyweight Match: .17 HM2 Vs. .22 LR".
Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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