.17 HM2

.17 Hornady Mach 2

Left: .17 HM2, Right: .17 HMR

Type

Rifle

Place of origin

United States

Production history

Designer

Hornady

Designed

2004

Manufacturer

CCI/Hornady/Eley

Produced

2004–present

Specifications

Parent case

.22 Stinger

Case type

Rimmed, 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 length

1.00 in (25 mm)

Primer type

Rimfire

Maximum pressure

24,000 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 ^[1]

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.

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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.^[2] 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).^[3] 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.^[4]

Converting rifles

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.^[4]

References

^ "17 Mach 2 17 gr V-MAX Varmint Express Rimfire". hornady.com. Archived from the original on August 8, 2018. Retrieved August 8, 2018.
^ ".17 Mach 2 Ballistics". Archived from the original on August 6, 2018. Retrieved August 6, 2018.
^ Hawks, Chuck. "Hornady's .17 Mach 2". chuckhawks.com. Archived from the original on July 23, 2018. Retrieved August 8, 2018.
^ ^a ^b Simpson, Layne (January 4, 2011). "The Ultimate Flyweight Match: .17 HM2 Vs. .22 LR". shootingtimes.com. Archived from the original on August 5, 2018. Retrieved August 5, 2018.

External links

Eley
CCI

v t e Hornady
Cartridges	.17 HM2 .17 HMR .17 Hornet .204 Ruger 6mm ARC 6.5mm Creedmoor .30 TC .300 Ruger Compact Magnum .300 Precision Rifle Cartridge .308 Marlin Express .338 Marlin Express .338 Ruger Compact Magnum .375 Ruger .376 Steyr .416 Ruger .450 Bushmaster .450 Marlin .480 Ruger

Cartridges with bullet diameter between 4 mm (0.16 in) and 5 mm (0.20 in)

Rimfire cartridges

Centerfire cartridges

Pistol, Carbine and PDW cartridges	4.25mm Liliput 4.38×30mm Libra 4.5×40mmR 4.6×30mm HK
Revolver cartridges	.17 Bumble Bee
Rifle cartridges	.17 Hornet .17 Mach IV .17 Remington .17 Remington Fireball .17 Ackley Bee 4.6×36mm 4.85×49mm

This page was last edited on 14 February 2024, at 04:10

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