Rimfire · CIP · Not SAAMI standardized · CIP standardizedObsolete
4mm Randz Court
4mm Randz Court is a rimfire straight-walled rimfire cartridge of Germany origin.
- Caliber
- 0.1732″ · 4.4 mm
- Introduced
- 1942
- Case
- Rimfire
- Primary use
- Target, Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1942
- Type
- Rimfire
- Origin
- Germany
- Inventor
- Nicolas Flobert
- Manufacturer
- Sellier & Bellot
- Standard
- CIP · Not SAAMI standardized · CIP standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 1 gr H₂O
- Twist (typical)
- 1:17.7
- Primer
- Rimfire
- Case type
- Rimfire
- Max pressure
- 14,500 psi, CIP transducer
- Eff. range
- 100 yd
- Max range
- 500 yd
- Recoil
- 0.1 ft·lb
Introduced by Sellier & Bellot
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 4mm Randz Court, 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
- —
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 · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 4.40 | 0.173 | ✓ |
| Neck ⌀ | 4.58 | 0.180 | |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 4.65 | 0.183 | ✓ |
| Rim ⌀ | 6.10 | 0.240 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.30 | 0.051 | ✓ |
| Neck length | n/a | ||
| Case length | 6.60 | 0.260 | ✓ |
| Overall length | 9.20 | 0.362 | ✓ |
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. 4mm Randz Court is highlighted below.
Missing a dimension for 4mm Randz Court? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
Connected reference
History
Introduced around 1942 by Nicolas Flobert.
FAQs
- What twist rate does 4mm Randz Court use?
- 4mm Randz Court typically uses a 1:17.7 twist rate.
- What bullet diameter is 4mm Randz Court?
- 4mm Randz Court uses a 0.1732″ (4.4 mm) diameter bullet.
- Is 4mm Randz Court still in production?
- 4mm Randz Court is discontinued; typical availability is rare.
- What is 4mm Randz Court used for?
- 4mm Randz Court is primarily used for target, hunting.
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 →
