Revolver · CIP · Not SAAMI standardized · CIP standardizedObsolete
.320 Revolver Long
.320 Revolver Long is a rimmed straight-walled revolver cartridge of United Kingdom origin.
- Caliber
- 0.3031″ · 7.7 mm
- Introduced
- 1868
- Case
- Rimmed
- Parent
- .32 Rimfire
- Primary use
- Self-Defense, Target
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1868
- Type
- Revolver
- Origin
- United Kingdom
- Inventor
- P. Webley & Son
- Manufacturer
- Webley & Scott
- Standard
- CIP · Not SAAMI standardized · CIP standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Collector
- Case capacity
- 11.4 gr H₂O
- Twist (typical)
- 1:17.7
- Primer
- Berdan
- Case type
- Rimmed
- Max pressure
- 14,504 psi, CIP transducer
- Eff. range
- 50 yd
- Max range
- 250 yd
- Recoil
- 1 ft·lb
- Subsonic
- Capable
Introduced by Webley & Scott
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .320 Revolver Long, 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
- .32 Rimfire
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 · secondary source| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.70 | 0.303 | ✓ |
| Neck ⌀ | 8.00 | 0.315 | · |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 8.05 | 0.317 | ✓ |
| Rim ⌀ | 9.65 | 0.380 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.32 | 0.052 | ✓ |
| Neck length | n/a | ||
| Case length | 20.50 | 0.807 | ✓ |
| Overall length | 30.00 | 1.181 | ✓ |
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. .320 Revolver Long 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 1868 by P. Webley & Son, derived from the .32 Rimfire.
FAQs
- What twist rate does .320 Revolver Long use?
- .320 Revolver Long typically uses a 1:17.7 twist rate.
- What bullet diameter is .320 Revolver Long?
- .320 Revolver Long uses a 0.3031″ (7.7 mm) diameter bullet.
- Is .320 Revolver Long still in production?
- .320 Revolver Long is obsolete; typical availability is collector.
- What is .320 Revolver Long used for?
- .320 Revolver Long is primarily used for self-defense, target.
- What is .320 Revolver Long based on?
- .320 Revolver Long is derived from the .32 Rimfire 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 →
