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.

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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

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

Pressure & range

Max pressure: 26,000 psi, SAAMI transducer
Eff. range: 200 yd
Max range: 1950 yd
Recoil: 0.16–0.2 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 ⌀	6.15	0.242	✓
Rim ⌀	7.47	0.294	✓
Belt ⌀	n/a
Rim thickness	1.27	0.050	✓
Neck length	3.52	0.139	≈
Case length	27.03	1.064	✓
Overall length	34.67	1.365	✓

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

Howa 1500 Mini .22 LRTaurus Model 17 Tracker .17 HMR 6.5-inchChristensen Arms RangerSavage Arms B17 BNS .17 HMRBergara B-14R .17 HMRTaurus Model 17 .17 HMR 6.5-inchCZ CZ 457 American 17 HMRCZ 457 Varmint .17 HMRBergara Bergara BMR .17 HMR 18-inchCZ 457 American .17 HMRCZ 457 American Combo .22 LR/.17 HMRCZ CZ 457 Varmint MTR .22 LR 20.5-inch

Lineage

Family TreeOpen .17 HMR in the interactive cartridge family tree

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 →

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