.17 HM2

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.

.17 Hornady Mach 2
Left: .17 HM2, Right: .17 HMR
TypeRifle
Place of originUnited States
Production history
DesignerHornady
Designed2004
ManufacturerCCI/Hornady/Eley
Produced2004–present
Specifications
Parent case.22 Stinger
Case typeRimmed, bottleneck
Bullet diameter.172 in (4.4 mm)
Land diameter.168 in (4.3 mm)
Neck diameter.180 in (4.6 mm)
Shoulder diameter.226 in (5.7 mm)
Base diameter.226 in (5.7 mm)
Rim diameter.275 in (7.0 mm)
Rim thickness.043 in (1.1 mm)
Case length.714 in (18.1 mm)
Overall length1.00 in (25 mm)
Primer typeRimfire
Maximum pressure24,000 psi (170 MPa)
Ballistic performance
Bullet mass/type Velocity Energy
17 gr (1 g) V-Max 2,100 ft/s (640 m/s) 166 ft⋅lbf (225 J)
Source(s): Hornady
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