Pistol · Not SAAMI standardized · Not standardizedObsolete
.45 Mars Long
.45 Mars Long is a rimless bottlenecked pistol cartridge of United Kingdom origin.
- Caliber
- 0.4488″ · 11.4 mm
- Introduced
- 1899
- Case
- Rimless
- Primary use
- Self-Defense, Target
- Status
- Obsolete
- Obsolete
- Obsolete
- Introduced
- 1899
- Type
- Pistol
- Origin
- United Kingdom
- Inventor
- Kynoch (approx: maker of record)
- Manufacturer
- Kynoch
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Collector
- Case capacity
- 34.4 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Large Pistol
- Case type
- Rimless
- Max pressure
- 14,500 psi, CIP transducer
- Eff. range
- 50 yd
- Max range
- 250 yd
- Recoil
- 20.4 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .45 Mars 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
- —
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 ⌀ | 11.40 | 0.449 | · |
| Neck ⌀ | 12.06 | 0.475 | · |
| Shoulder ⌀ | 12.07 | 0.475 | · |
| Shoulder angle | 23° | — | |
| Base ⌀ | 12.65 | 0.498 | · |
| Rim ⌀ | 12.57 | 0.495 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.07 | 0.042 | · |
| Neck length | 6.57 | 0.259 | |
| Case length | 27.76 | 1.093 | · |
| Overall length | 35.66 | 1.404 | · |
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. .45 Mars Long is highlighted below.
Missing a dimension for .45 Mars Long? 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
Introduced around 1899.
FAQs
- What twist rate does .45 Mars Long use?
- .45 Mars Long typically uses a 1:16 twist rate.
- What bullet diameter is .45 Mars Long?
- .45 Mars Long uses a 0.4488″ (11.4 mm) diameter bullet.
- Is .45 Mars Long still in production?
- .45 Mars Long is obsolete; typical availability is collector.
- What is .45 Mars Long used for?
- .45 Mars Long is primarily used for self-defense, target.
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 →
