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Rifle · Proprietary

6.5mm BRX

6.5 BRX6.5 BR Xtreme

Blown-out, necked-up version of the 6mm BR for long-range benchrest; fills the gap between 6mm BR and 6.5mm Creedmoor for 600–1000 yard competition..

Caliber
0.264″ · 6.706 mm
Introduced
2003
Case
Rimless
Parent
6mm BR Norma
Status
Active
Identity
Introduced
2003
Type
Rifle
Origin
United States
Inventor
Bruno Berger / Lou Murdica
Standard
Proprietary
Status
Active
Availability
Uncommon
Build
Primer
Boxer Small Rifle
Case type
Rimless
Pressure & range
Max pressure
58,740 psi
Eff. range
1000 yd

Ballistics

Published velocity/energy data isn't available for 6.5mm BRX. Parent case: 6mm BR (necked up, blown out).

Dimensionscase measurements · scale drawing · size vs familiar rounds

Case dimensions — the scale drawing at the top of the page is built from these.

SAAMI · approximate
Measuremmin✓
Bullet ⌀6.710.264·
Neck ⌀7.370.290~
Shoulder ⌀11.630.458~
Shoulder angle30°—·
Base ⌀11.910.469·
Rim ⌀12.010.473·
Belt ⌀n/a
Rim thickness1.370.054·
Neck length5.330.210≈
Case length39.621.560·
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. 6.5mm 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

Immediate parent
6mm BR Norma
Family TreeOpen 6.5mm BRX in the interactive cartridge family tree↗

Connected reference

FirearmsFirearms in 6.5mm BRX↗

History

The 6.5mm BRX combines necking the 6mm BR up to 6.5mm with blowing out the case for improved capacity. It offers the inherent accuracy of BR-derived brass with 6.5mm bullet selection, sitting between the 6mm BR and 6.5 Creedmoor in performance. Used in long-range benchrest and F-Class competition.

FAQs

What bullet diameter is 6.5mm BRX?
6.5mm BRX uses a 0.264″ (6.706 mm) diameter bullet.
Is 6.5mm BRX still in production?
6.5mm BRX is active; typical availability is uncommon.
What is 6.5mm BRX based on?
6.5mm BRX is derived from the 6mm BR (necked up, blown out) 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 →