Rimfire · SAAMI
.17 Mach 2
The .17 Mach 2 (.17 HM2) was developed by Hornady and CCI in 2004.
- Caliber
- 0.1724″ · 4.38 mm
- Introduced
- 2004
- Case
- Rimfire
- Parent
- .22 Long Rifle
- Primary use
- varminting, target
- Status
- Active
- Introduced
- 2004
- Type
- Rimfire
- Origin
- United States
- Inventor
- CCI / Hornady / Aguila
- Manufacturer
- Hornady/CCI
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 4.8 gr H₂O
- Twist (typical)
- 1:9
- Primer
- Rimfire
- Case type
- Rimfire
- Max pressure
- 24,000 psi, SAAMI transducer
- Eff. range
- 150 yd
- Max range
- 1850 yd
- Recoil
- 0.14 ft·lb
Ballistics
Published velocity/energy data isn't available for .17 Mach 2. Parent case: .22 Long Rifle.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
CIP TDCC · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 4.38 | 0.172 | ✓ |
| Neck ⌀ | 4.83 | 0.190 | ~ |
| Shoulder ⌀ | 5.74 | 0.226 | ✓ |
| Shoulder angle | 20° | — | ✓ |
| Base ⌀ | 5.74 | 0.226 | ✓ |
| Rim ⌀ | 7.06 | 0.278 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.09 | 0.043 | ✓ |
| Neck length | 2.66 | 0.105 | ≈ |
| Case length | 18.14 | 0.714 | ✓ |
| Overall length | 25.40 | 1.000 | ✓ |
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 Mach 2 is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Firearms chambered in .17 Mach 2
Lineage
History
The .17 Mach 2 was introduced in 2004 by CCI / Hornady / Aguila, based on the .22 Long Rifle case (United States).
FAQs
- What twist rate does .17 Mach 2 use?
- .17 Mach 2 typically uses a 1:9 twist rate.
- What bullet diameter is .17 Mach 2?
- .17 Mach 2 uses a 0.1724″ (4.38 mm) diameter bullet.
- Is .17 Mach 2 still in production?
- .17 Mach 2 is active; typical availability is common.
- What is .17 Mach 2 used for?
- .17 Mach 2 is primarily used for varminting, target.
- What is .17 Mach 2 based on?
- .17 Mach 2 is derived from the .22 Long Rifle case.
Sources & provenance
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Reference Gun Digest Books — Cartridges of the World (Gun Digest Books, F. C. Barnes) · grain weights
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 18 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
