8.6 BLACKOUT
Technical, Ballistic & Compatibility Guide
Prepared as an educational resource for shooters, hunters, reloaders, suppressor users and firearm enthusiasts.
Steinel Ammunition Co. | https://steinelammo.com | https://steinelammo.com/product-category/rifle-ammo/8-6-blackout/
Executive Summary
The 8.6 Blackout is a modern .338-caliber cartridge developed from a shortened 6.5 Creedmoor case. It was designed to deliver efficient performance from compact rifles while supporting both supersonic and subsonic ammunition configurations.
Development History
The cartridge was developed to combine heavy projectile capability with modern short-action rifle platforms. Its design emphasizes short-barrel efficiency, suppressor compatibility, and reliable operation in modern rifle systems.
Technical Specifications
Bullet Diameter: 0.3385 in (8.60 mm), Case Length: 1.685 in, Rim Diameter: 0.473 in, Overall Length: approximately 2.80–2.825 in, Parent Case: 6.5 Creedmoor-derived design, Maximum Pressure: 55,000 psi.
Platform Compatibility
The cartridge is intended for compatible short-action platforms, including AR-10/SR-25 style rifles and appropriate bolt-action systems configured specifically for 8.6 Blackout chambers.
Steinel Product
210gr T-Rex SCHP
300gr SMK (Bolt)
300gr SMK (AR)
350gr SCHP
350gr SCHP SBR
Bullet Weight Configuration Primary Use
210gr Supersonic Hunting
300gr Subsonic Precision Shooting
300gr Subsonic Semi-Auto Use
350gr Subsonic Heavy Projectile Applications
350gr Short Barrel Compact Platforms
Steinel Ammunition Co. | https://steinelammo.com | https://steinelammo.com/product-category/rifle-ammo/8-6-blackout/
Ballistic Overview
Performance varies depending on projectile weight, barrel length, environmental conditions, and firearm configuration. Both supersonic and subsonic loads are available, allowing users to tailor ammunition selection to specific applications.
Trajectory Considerations
Supersonic loads generally offer flatter trajectories, while subsonic loads prioritize suppressor compatibility and reduced sound signatures.
Suppressor Applications
The cartridge is frequently associated with suppressor-equipped rifles due to its ability to use heavy projectiles in subsonic configurations.
Safety & Handling
Always verify firearm chambering before use. Inspect ammunition before loading, follow manufacturer recommendations, and store ammunition in cool, dry environments.
Steinel Ammunition Co. | https://steinelammo.com | https://steinelammo.com/product-category/rifle-ammo/8-6-blackout/
Frequently Asked Questions
What makes 8.6 Blackout unique?
Its combination of .338-caliber projectiles, short-barrel efficiency, and support for subsonic and supersonic configurations.
Is it compatible with AR-15 rifles?
No. It is generally associated with larger short-action platforms such as AR-10/SR-25 style systems.
Can it be used with suppressors?
Many shooters use the platform with suppressors, particularly with subsonic ammunition.
What ammunition options does Steinel offer?
Steinel offers multiple configurations including 210gr, 300gr, and 350gr product variants.
Steinel Ammunition Quality Philosophy
Steinel Ammunition is known for specialty-caliber support, lot consistency, dimensional verification, and quality-focused production processes. The company supports both modern and hard-to-find cartridge platforms.
Resources
Website: https://steinelammo.com
8.6 Blackout Category: https://steinelammo.com/product-category/rifle-ammo/8-6-blackout/ Email: info@steinelammo.com
Steinel Ammunition Co. | https://steinelammo.com | https://steinelammo.com/product-category/rifle-ammo/8-6-blackout/