Autocannon · NATO
30x173mm
The 30x173mm (STANAG 4624) is a Swiss-origin autocannon round in service from the 1970s (Oerlikon KCA, GAU-8)..
- Caliber
- 1.1811″ · 30 mm
- Introduced
- 1970
- Case
- Rimless
- Primary use
- Military
- Status
- Active
- Introduced
- 1970
- Type
- Autocannon
- Origin
- Switzerland
- Inventor
- Oerlikon (approx: maker of record)
- Standard
- NATO
- Status
- Active
- Availability
- Not commercially available
- Case capacity
- 1950.5 gr H₂O
- Twist (typical)
- 1:24
- Primer
- Percussion (military)
- Case type
- Rimless
- Max pressure
- 44,200 psi, CIP transducer
- Eff. range
- 1500 yd
- Max range
- 4500 yd
- Recoil
- 2,324.1–2,396.1 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 30x173mm, 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.
Wikipedia · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 30.00 | 1.181 | · |
| Neck ⌀ | 31.31 | 1.233 | |
| Shoulder ⌀ | 34.89 | 1.374 | |
| Shoulder angle | 24° | — | |
| Base ⌀ | 36.75 | 1.447 | |
| Rim ⌀ | 36.75 | 1.447 | |
| Belt ⌀ | n/a | ||
| Rim thickness | 3.76 | 0.148 | |
| Neck length | 30.98 | 1.220 | |
| Case length | 173.00 | 6.811 | |
| Overall length | 289.12 | 11.383 | |
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. 30x173mm is highlighted below.
Missing a dimension for 30x173mm? 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.
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.
Connected reference
History
The 30x173mm (STANAG 4624) is a Swiss-origin autocannon round in service from the 1970s (Oerlikon KCA, GAU-8).
FAQs
- What twist rate does 30x173mm use?
- 30x173mm typically uses a 1:24 twist rate.
- What bullet diameter is 30x173mm?
- 30x173mm uses a 1.1811″ (30 mm) diameter bullet.
- Is 30x173mm still in production?
- 30x173mm is active; typical availability is not commercially available.
- What is 30x173mm used for?
- 30x173mm is primarily used for military.
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 →
