8.6 Blackout: New Subsonic Round...But Does Anyone Care?

Published on February 24, 2023
Duration: 25:04

This guide covers the setup and considerations for shooting the 8.6 Blackout cartridge, emphasizing suppressor use and potential rifle platform quirks. It highlights the importance of a break-in period for certain suppressors and advises on managing the significant bullet drop associated with subsonic rounds. The information is presented with the authority of an experienced firearms instructor, detailing practical aspects of this specialized cartridge.

Quick Summary

The 8.6 Blackout is a potent subsonic cartridge utilizing .338 projectiles in necked-down 6.5 Creedmoor brass, offering superior energy over 300 Blackout. Key considerations include its high cost ($3/round), significant bullet drop, and the need for bonded projectiles due to a fast 1:3 twist rate. Suppressors like the CGS Hecate and Q Pork Chop are suitable, with a break-in period recommended for titanium cans.

Chapters

  1. 00:00Introduction and Sound Test
  2. 03:388.6 Blackout Concept and Origin
  3. 07:18Projectile Weights and Ballistics
  4. 08:01Suppressor Options and Maintenance
  5. 13:11The 1:3 Twist Rate
  6. 14:41Range and Bullet Drop
  7. 15:56Rifle Platform: The Q Fix
  8. 17:51Pros, Cons, and Market Viability

Frequently Asked Questions

What is the 8.6 Blackout cartridge?

The 8.6 Blackout is a new subsonic cartridge designed for AR-10 and bolt-action platforms. It uses 6.5 Creedmoor brass necked down to accept a .338 projectile, offering significantly more energy than 300 Blackout for suppressed applications.

What are the key ballistics of 8.6 Blackout subsonic rounds?

Subsonic 8.6 Blackout rounds typically use projectiles weighing 285-360 grains, achieving muzzle velocities around 853 fps and producing approximately 547 ft-lbs of muzzle energy. This represents a substantial increase in energy over 300 Blackout.

What are the challenges associated with shooting 8.6 Blackout?

Challenges include a high cost per round (around $3.00), significant bullet drop at longer ranges (approx. 147 inches at 300 yards), and potential light primer strikes on certain rifle platforms like the Q Fix. Bonded projectiles are recommended.

Which suppressors are recommended for 8.6 Blackout?

Recommended suppressors include the CGS Hecate and the Q Pork Chop. For 3D-printed titanium suppressors, a break-in period with supersonic rounds is advised to prevent titanium dust blowback.

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