What twist rate does .17 HMR use?

.17 HMR typically uses a 1:9 twist rate.

What bullet diameter is .17 HMR?

.17 HMR uses a 0.172″ (4.369 mm) diameter bullet.

Is .17 HMR still in production?

.17 HMR is active; typical availability is common.

What is .17 HMR used for?

.17 HMR is primarily used for varmint, target.

What is .17 HMR based on?

.17 HMR is derived from the .22 WMR case.

Lindcott Armory

Rimfire · SAAMI

.17 HMR

Also known as .17 Hornady Magnum Rimfire

Flat-shooting rimfire varmint cartridge.

Caliber: 0.172″ · 4.369 mm
Introduced: 2002
Case: Rimfire
Parent: .22 WMR
Primary use: Varmint, Target
Status: Active

Buy this cartridge

Buy at Rivertown

Buying from Rivertown

Partner link

VelocityBeing verified

EnergyBeing verified

Typical grains16 · 17 · 20 gr

Identity

Introduced: 2002
Type: Rimfire
Origin: United States
Inventor: Hornady
Manufacturer: Hornady
Standard: SAAMI
Status: Active
Availability: Common

Build

Case capacity: 5 gr H₂O
Twist (typical): 1:9
Primer: Rimfire
Case type: Rimfire

Pressure & range

Max pressure: 26,000 psi
Eff. range: 200 yd
Recoil: 0.3–0.6 ft·lb
Subsonic: Capable

Introduced by Hornady

Ballistics

Published velocity/energy data isn't available for .17 HMR. Parent case: .22 WMR.

Performance

Best for Withheld until verified

Dimensionscase measurements · scale drawing · size vs familiar rounds

Case dimensions — the scale drawing at the top of the page is built from these.

SAAMI · verified

Measure	mm	in	✓
Bullet ⌀	4.37	0.172	✓
Neck ⌀	4.83	0.190	✓
Shoulder ⌀	6.04	0.238	✓
Shoulder angle	25°	—	✓
Base ⌀	6.08	0.239	✓
Rim ⌀	7.26	0.286	✓
Belt ⌀	n/a
Rim thickness	1.27	0.050	✓
Neck length	3.49	0.137	≈
Case length	26.87	1.058	✓
Overall length	34.26	1.349	✓

Size vs familiar rounds

Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. .17 HMR is highlighted below.

Factory loads

Verification

Being verified

Advertised FPS, energy, and BC are withheld until loads clear verification.

Firearms chambered in .17 HMR

12 models in the database chamber .17 HMR. Browse all →

Christensen Arms RangerSavage B17 BNS .17 HMRTaurus Model 17 .17 HMR 6.5-inchChristensen Arms Ranger 22CZ CZ 457 Varmint .22 LR 20-inchCZ 457 VarmintCZ 457 AmericanCZ-USA 457 American 22LRCZ-USA CZ 457 Lux .22 WMR 24.8-inchCZ-USA CZ 457 Varmint MTR .22 LR 20.5-inchCZ-USA CZ 457 Lux .22 LR 24.8-inchCZ-USA CZ 457 American .22 WMR 24.8-inch

Lineage

Family TreeOpen .17 HMR in the interactive cartridge family tree

Connected reference

Loads102 factory loads for .17 HMR FirearmsFirearms in .17 HMR

History

Introduced by Hornady in 2002 as the first successful .17 caliber rimfire. Rapidly became most popular rimfire varmint cartridge. Based on necked-down .22 WMR case.

FAQs

What twist rate does .17 HMR use?: .17 HMR typically uses a 1:9 twist rate.
What bullet diameter is .17 HMR?: .17 HMR uses a 0.172″ (4.369 mm) diameter bullet.
Is .17 HMR still in production?: .17 HMR is active; typical availability is common.
What is .17 HMR used for?: .17 HMR is primarily used for varmint, target.
What is .17 HMR based on?: .17 HMR is derived from the .22 WMR case.

Sources & provenance

Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 102 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →