Lindcott Armory Rifle · Proprietary
6mm BRX
Blown-out version of the 6mm BR Norma with a sharper shoulder for improved case capacity; popular in F-Class long-range and benchrest competition..
- Caliber
- 0.243″ · 6.172 mm
- Introduced
- 2000
- Case
- Rimless
- Parent
- 6mm BR Norma
- Status
- Active
- Introduced
- 2000
- Type
- Rifle
- Origin
- United States
- Inventor
- Bruno Berger / Lou Murdica
- Standard
- Proprietary
- Status
- Active
- Availability
- Uncommon
- Primer
- Boxer Small Rifle
- Case type
- Rimless
- Max pressure
- 58,740 psi
- Eff. range
- 1000 yd
Ballistics
- 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.
Wikipedia · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.17 | 0.243 | · |
| Neck ⌀ | 6.88 | 0.271 | · |
| Shoulder ⌀ | 11.63 | 0.458 | · |
| Shoulder angle | 30° | — | · |
| Base ⌀ | 11.94 | 0.470 | ~ |
| Rim ⌀ | 12.01 | 0.473 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ~ |
| Neck length | 5.33 | 0.210 | ≈ |
| Case length | 39.62 | 1.560 | ~ |
| Overall length | — | — | |
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 BRX 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 6mm BRX takes the inherently accurate 6mm BR case and blows it out with a sharper shoulder for approximately 3–5% more case capacity. The result is slightly higher velocity with the same barrel life characteristics as the parent case, making it attractive for F-Class Open and long-range benchrest competitors who want to push 105–115 grain 6mm bullets at higher velocity.
FAQs
- What bullet diameter is 6mm BRX?
- 6mm BRX uses a 0.243″ (6.172 mm) diameter bullet.
- Is 6mm BRX still in production?
- 6mm BRX is active; typical availability is uncommon.
- What is 6mm BRX based on?
- 6mm BRX is derived from the 6mm BR Norma (blown out) case.
Sources & provenance
- ManufacturerSierra Bullets — 6mm BR Norma load data (parent case) · bullet ⌀, grain weightsarchived
- SecondaryAccurateShooter.com — 6BR Improved Cartridge Guide (6 BRX / 6 Dasher) · bullet ⌀, velocityarchived
- SecondaryPrecisionRifleBlog.com — 6BRA, 6BRX & 6BR Load Data — What The Pros Use · velocity, grain weightsarchived
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →