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 based on?

.30 BR is derived from the 6mm BR Norma (necked up) case.

Lindcott Armory

Rifle · Proprietary

.30 BR

Also known as 30 BR · .30 Benchrest · .30BR

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: 6mm BR Norma
Status: Active

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Velocity2,950–3,050 fps

Energy2,280–2,437 ft·lb · est.

Identity

Introduced: 1985
Type: Rifle
Origin: United States
Inventor: Lapua / benchrest community
Standard: Proprietary
Status: Active
Availability: Uncommon

Build

Primer: Boxer Small Rifle
Case type: Rimless

Pressure & range

Eff. range: 300 yd

Ballistics

Representative trajectory · velocity only, no drag model · 100 yd zero0–800 yd

Drop Zero

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: 6mm BR Norma

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.

Powder $/lb Charge (gr) Bullet $/ea Primer $/ea Brass reuses Brass $/ea

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Lineage

Family TreeOpen .30 BR in the interactive cartridge family tree

Connected reference

FirearmsFirearms in .30 BR ToolCompare ballistics

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 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 based on?: .30 BR is derived from the 6mm BR Norma (necked up) 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 ⌀, velocity, grain weights 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 →