Rifle · Proprietary
.30 BR
Necked-up 6mm BR for 600 and 1000-yard benchrest competition; combines the accuracy heritage of BR brass with .30 caliber bullet selection..
- Caliber
- 0.3079″ · 7.82 mm
- Introduced
- 1985
- Case
- Rimless
- Parent
- .308 Winchester
- Primary use
- Hunting
- Status
- Active
- Introduced
- 1985
- Type
- Rifle
- Origin
- United States
- Inventor
- Lapua / benchrest community
- Manufacturer
- Lapua
- Standard
- Proprietary
- Status
- Active
- Availability
- Uncommon
- Case capacity
- 41 gr H₂O
- Twist (typical)
- 1:17
- Primer
- Boxer Small Rifle
- Case type
- Rimless
- Max pressure
- 58,740 psi, CIP transducer
- Eff. range
- 300 yd
- Max range
- 3550 yd
- Recoil
- 9.8–11.2 ft·lb
Introduced by Lapua
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .30 BR, 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
- .308 Winchester
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 · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.82 | 0.308 | ✓ |
| Neck ⌀ | 8.33 | 0.328 | ✓ |
| Shoulder ⌀ | 11.66 | 0.459 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 11.94 | 0.470 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 8.36 | 0.329 | ≈ |
| Case length | 38.41 | 1.512 | ✓ |
| Overall length | 58.00 | 2.283 | ~ |
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. .30 BR 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
The .30 BR is made by necking the 6mm BR case up to .308 caliber, retaining the exceptional accuracy characteristics of BR-derived brass while using the wide selection of .30 caliber match bullets. It is used in 600-yard and 1000-yard benchrest competition and has a devoted following in that niche.
FAQs
- What twist rate does .30 BR use?
- .30 BR typically uses a 1:17 twist rate.
- What bullet diameter is .30 BR?
- .30 BR uses a 0.3079″ (7.82 mm) diameter bullet.
- Is .30 BR still in production?
- .30 BR is active; typical availability is uncommon.
- What is .30 BR used for?
- .30 BR is primarily used for hunting.
- What is .30 BR based on?
- .30 BR is derived from the .308 Winchester case.
Sources & provenance
- Standard C.I.P. (Commission Internationale Permanente) — C.I.P. TDCC Tab I — 30 BR (Country of origin: US) · bullet ⌀ archived
- Secondary 6mmBR.com / AccurateShooter — 30BR Guide — Benchrest Cartridge with Reloading & Accuracy Info · bullet ⌀, grain weights, velocity archived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
