Rifle · Not SAAMI standardized · Not standardizedObsolete
4.85x49mm
4.85x49mm is a rimless bottlenecked rifle cartridge of United Kingdom origin.
- Caliber
- 0.197″ · 5.004 mm
- Introduced
- 1980
- Case
- Rimless
- Parent
- 5.56x45mm NATO
- Primary use
- Hunting
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1980
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Royal Small Arms Factory
- Manufacturer
- Royal Small Arms Factory
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 33.5 gr H₂O
- Twist (typical)
- 1:10.5
- Primer
- Small Rifle
- Case type
- Rimless
- Max pressure
- 52,000 psi, CIP transducer
- Eff. range
- 400 yd
- Max range
- 2000 yd
- Recoil
- 1.5–1.8 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 4.85x49mm, 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
- 5.56x45mm NATO
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 ⌀ | 5.00 | 0.197 | · |
| Neck ⌀ | 5.59 | 0.220 | · |
| Shoulder ⌀ | 8.97 | 0.353 | · |
| Shoulder angle | 18° | — | |
| Base ⌀ | 9.53 | 0.375 | · |
| Rim ⌀ | 9.55 | 0.376 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.04 | 0.041 | · |
| Neck length | 5.17 | 0.204 | |
| Case length | 48.90 | 1.925 | · |
| Overall length | 62.36 | 2.455 | · |
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. 4.85x49mm is highlighted below.
Missing a dimension for 4.85x49mm? 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
Developed by Royal Small Arms Factory, derived from the 5.56x45mm NATO.
FAQs
- What twist rate does 4.85x49mm use?
- 4.85x49mm typically uses a 1:10.5 twist rate.
- What bullet diameter is 4.85x49mm?
- 4.85x49mm uses a 0.197″ (5.004 mm) diameter bullet.
- Is 4.85x49mm still in production?
- 4.85x49mm is discontinued; typical availability is rare.
- What is 4.85x49mm used for?
- 4.85x49mm is primarily used for hunting.
- What is 4.85x49mm based on?
- 4.85x49mm is derived from the 5.56x45mm NATO 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 →
