Rifle · SAAMI
6mm Remington
Fast, flat-shooting 6mm that lost the marketing war to .243 Winchester.
- Caliber
- 0.2433″ · 6.18 mm
- Introduced
- 1955
- Case
- Rimless
- Parent
- 7mm Mauser
- Primary use
- Varmint, Hunting, Target
- Status
- Active
- Introduced
- 1955
- Type
- Rifle
- Origin
- United States
- Inventor
- Remington Arms
- Manufacturer
- Remington Arms
- Standard
- SAAMI
- Status
- Active
- Availability
- Moderate
- Case capacity
- 55 gr H₂O
- Twist (typical)
- 1:9
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 65,000 psi
- Eff. range
- 400 yd
- Max range
- 4000 yd
- Recoil
- 8–12 ft·lb
Introduced by Remington Arms
Ballistics
Published velocity/energy data isn't available for 6mm Remington. Parent case: 7x57mm Mauser.
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 · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.18 | 0.243 | ✓ |
| Neck ⌀ | 7.01 | 0.276 | ✓ |
| Shoulder ⌀ | 10.90 | 0.429 | ✓ |
| Shoulder angle | 26° | — | ✓ |
| Base ⌀ | 11.96 | 0.471 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.24 | 0.049 | ✓ |
| Neck length | 8.91 | 0.351 | ≈ |
| Case length | 56.72 | 2.233 | ✓ |
| Overall length | 71.76 | 2.825 | ✓ |
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 Remington is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
6 reloading powders listed for 6mm Remington, fastest to slowest. Cross-reference in the finder →
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.
Firearms chambered in 6mm Remington
12 models in the database chamber 6mm Remington. Browse all →
Lineage
Connected reference
History
Introduced as .244 Remington in 1955 to compete with Winchester's .243. Initially marketed as varmint cartridge with slow twist barrels that wouldn't stabilize heavier bullets. Winchester's .243 had faster twist and was marketed for deer. Remington lost the competition badly. Renamed 6mm Remington in 1963 with proper twist but damage was done. Excellent cartridge that never recovered from poor initial marketing.
FAQs
- What twist rate does 6mm Remington use?
- 6mm Remington typically uses a 1:9 twist rate.
- What bullet diameter is 6mm Remington?
- 6mm Remington uses a 0.2433″ (6.18 mm) diameter bullet.
- Is 6mm Remington still in production?
- 6mm Remington is active; typical availability is moderate.
- What is 6mm Remington used for?
- 6mm Remington is primarily used for varmint, hunting, target.
- What is 6mm Remington based on?
- 6mm Remington is derived from the 7x57mm Mauser case.
- What are the best powders for 6mm Remington?
- Reloading powders commonly listed for 6mm Remington include N550, Vihtavuori N140, N540, Vihtavuori N150, among 6 suitable options.
Sources & provenance
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Standard SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) — ANSI/SAAMI Z299.4 – 2015 (Centerfire Rifle) — Velocity & Pressure / Cartridge & Chamber Drawings · grain_ballistics, representative_gun archived
- Manufacturer Hornady — 6mm Rem 95 gr SST Superformance (Item #81663) · grain_ballistics, representative_gun archived
- Manufacturer Remington — Core-Lokt 6mm Remington Ammo | 100 Grain, 3100 FPS (SKU 29-29051 / R6MM4) · grain_ballistics, representative_gun archived
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 23 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →