Rifle · Not SAAMI standardized · CIP standardizedObsolete
.310 Cadet
Australian/British military cadet training cartridge.
- Caliber
- 0.3228″ · 8.2 mm
- Introduced
- 1900
- Case
- Rimmed
- Primary use
- military, target
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1900
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- W. W. Greener
- Manufacturer
- Westley Richards and others
- Standard
- Not SAAMI standardized · CIP standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Collector
- Case capacity
- 19 gr H₂O
- Twist (typical)
- 1:12
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 15,954 psi, CIP transducer
- Eff. range
- 200 yd
- Max range
- 2800 yd
- Recoil
- 1–1.8 ft·lb
- Subsonic
- Capable
Ballistics
Published velocity/energy data isn't available for .310 Cadet — an obsolete/collector cartridge.
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 ⌀ | 8.20 | 0.323 | ✓ |
| Neck ⌀ | 8.31 | 0.327 | ✓ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 9.02 | 0.355 | ~ |
| Rim ⌀ | 10.41 | 0.410 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.09 | 0.043 | ✓ |
| Neck length | n/a | ||
| Case length | 28.45 | 1.120 | ✓ |
| Overall length | 40.64 | 1.600 | ✓ |
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. .310 Cadet is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
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.
History
The .310 Cadet cartridge was developed in Australia in the late 19th century for military cadet training with single-shot rifles. A reduced-power cartridge designed to minimize cost and recoil while teaching marksmanship basics. Discontinued as military training programs modernized.
FAQs
- What twist rate does .310 Cadet use?
- .310 Cadet typically uses a 1:12 twist rate.
- What bullet diameter is .310 Cadet?
- .310 Cadet uses a 0.3228″ (8.2 mm) diameter bullet.
- Is .310 Cadet still in production?
- .310 Cadet is discontinued; typical availability is collector.
- What is .310 Cadet used for?
- .310 Cadet is primarily used for military, target.
Sources & provenance
- Standard SAAMI — SAAMI cartridge & chamber drawing — .310 Cadet archived
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 1 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
