Rifle · Not SAAMI standardized · Not standardizedObsolete
6mm Musgrave
6mm Musgrave is a rimmed bottlenecked rifle cartridge of South Africa origin.
- Caliber
- 0.243″ · 6.172 mm
- Introduced
- 1955
- Case
- Rimmed
- Parent
- .303 British
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1955
- Type
- Rifle
- Origin
- South Africa
- Inventor
- Ben Musgrave Jnr
- Manufacturer
- Musgrave
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 49.9 gr H₂O
- Twist (typical)
- 1:8
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 46,500 psi, CIP transducer
- Eff. range
- 400 yd
- Max range
- 2000 yd
- Recoil
- 5.8–6.6 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 6mm Musgrave, 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
- .303 British
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 ⌀ | 6.17 | 0.243 | · |
| Neck ⌀ | 6.88 | 0.271 | · |
| Shoulder ⌀ | 10.18 | 0.401 | · |
| Shoulder angle | 16.7° | — | |
| Base ⌀ | 11.68 | 0.460 | · |
| Rim ⌀ | 13.66 | 0.538 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.63 | 0.064 | · |
| Neck length | 6.37 | 0.251 | |
| Case length | 56.09 | 2.208 | · |
| Overall length | 72.66 | 2.861 | · |
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. 6mm Musgrave is highlighted below.
Missing a dimension for 6mm Musgrave? 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.
Lineage
Connected reference
History
Introduced around 1955 by Ben Musgrave Jnr, derived from the .303 British.
FAQs
- What twist rate does 6mm Musgrave use?
- 6mm Musgrave typically uses a 1:8 twist rate.
- What bullet diameter is 6mm Musgrave?
- 6mm Musgrave uses a 0.243″ (6.172 mm) diameter bullet.
- Is 6mm Musgrave still in production?
- 6mm Musgrave is discontinued; typical availability is rare.
- What is 6mm Musgrave used for?
- 6mm Musgrave is primarily used for hunting.
- What is 6mm Musgrave based on?
- 6mm Musgrave is derived from the .303 British 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 →
