Rifle · CIP
.17 Libra
.17 Libra is a rimless bottlenecked rifle cartridge of Czech Republic origin.
- Caliber
- 0.1685″ · 4.28 mm
- Introduced
- 2002
- Case
- Rimless
- Parent
- .22 Hornet
- Primary use
- Hunting
- Status
- Active
- Introduced
- 2002
- Type
- Rifle
- Origin
- Czech Republic
- Inventor
- ČZW (Czech Weapons)
- Manufacturer
- ČZW (Czech Weapons)
- Standard
- CIP
- Status
- Active
- Availability
- Limited
- Case capacity
- 11.5 gr H₂O
- Twist (typical)
- 1:9.0
- Primer
- Small Rifle
- Case type
- Rimless
- Max pressure
- 62,366 psi, CIP transducer
- Eff. range
- 400 yd
- Max range
- 2000 yd
- Recoil
- 0.6–0.7 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .17 Libra, so this is the shape gravity alone gives the advertised velocity. Drag would steepen it. The tool below solves real loads through their published G1 or G7 model.
Open in Ballistic Compare- Parent case
- .22 Hornet
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
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 · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 4.28 | 0.169 | ✓ |
| Neck ⌀ | 4.90 | 0.193 | ✓ |
| Shoulder ⌀ | 6.88 | 0.271 | ✓ |
| Shoulder angle | 17° | — | ≈ |
| Base ⌀ | 7.56 | 0.298 | ✓ |
| Rim ⌀ | 7.65 | 0.301 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.24 | 0.049 | ✓ |
| Neck length | 5.09 | 0.200 | ≈ |
| Case length | 30.10 | 1.185 | ✓ |
| Overall length | 41.00 | 1.614 | ✓ |
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 Libra is highlighted below.
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Lineage
Connected reference
History
Introduced around 2001 by ČZW (Czech Weapons).
FAQs
- What twist rate does .17 Libra use?
- .17 Libra typically uses a 1:9.0 twist rate.
- What bullet diameter is .17 Libra?
- .17 Libra uses a 0.1685″ (4.28 mm) diameter bullet.
- Is .17 Libra still in production?
- .17 Libra is active; typical availability is limited.
- What is .17 Libra used for?
- .17 Libra is primarily used for hunting.
- What is .17 Libra based on?
- .17 Libra is derived from the .22 Hornet case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
