8.6 BLACKOUT, 350 Gr Maker REX (Rapid EXpanding), Subsonic – 20 Round Box
$59.99
Garand Thumb’s Favorite Subsonic 8.6 Blackout Cartridge
The Just Cause USA 8.6 Blackout 350gr Maker REX Subsonic is our flagship load, featured as Garand Thumb’s favorite subsonic 8.6 Blackout cartridge in his comprehensive testing. This heavy subsonic load delivers devastating terminal performance on medium to large game while remaining exceptionally quiet through suppressors. Our ammunition has been proven on everything from whitetail deer to Cape Buffalo in Africa.
We're the first 8.6 Blackout manufacturer to own a PCB conformal transducer for pressure testing. Every lot is verified for consistency and safety.
Terminal Performance You Can Trust
The Maker REX bullet is precision CNC-machined from solid copper with engineered expansion channels. Upon impact, the REX projectile expands to nearly three times its original diameter (.338" to approximately .950") while maintaining nearly 100% weight retention. This combination delivers maximum energy transfer and deep, straight-line penetration.
Our 350gr Maker REX has been successfully used to harvest:
- Cape Buffalo in Africa
- Whitetail deer, elk, wild hogs, and black bear across North America
- Exotic game including nilgai and kudu
Best Applications
Perfect For:
- Short-barrel rifle builds (8"-16" barrels)
- Close to medium range engagements
- Situations requiring minimal noise signature
- Hunters who value one-shot stopping power
Technical Specifications
| Specification | Value |
| Caliber | 8.6 Blackout (.338") |
| Bullet Weight | 350 grains |
| Bullet Type | Maker REX Expanding (Solid Copper) |
| Sectional Density (SD) | .438 |
| Ballistic Coefficient (BC) | .53 G1 |
| Case Type | 8.6 Blackout new brass |
| Primer | Large rifle |
| Recommended Barrel Twist Rate | 1:3 or 1:5 (Critical) |
| Box Quantity | 20 rounds |
Barrel Length & Velocity Data
| Barrel Length | Muzzle Velocity | Muzzle Energy |
| 8" Barrel | 950 fps | ~700 ft-lbs |
| 12" Barrel | 980 fps | ~745 ft-lbs |
| 16" Barrel | 1040 fps | ~840 ft-lbs |
Important Safety Notes
- Twist Rate Critical: This 350gr bullet will be safe to shoot in 1:3 and 1:5 twist 8.6 Blackout rifles. Slower twist rates may not stabilize the bullet correctly.
- Suppressor Requirement: Ensure your suppressor is rated for .338 caliber minimum.
- Not for .308 Winchester or 6.5 Creedmoor: Despite case similarity, NEVER fire 8.6 Blackout in .308 Win or 6.5 CM chambers. This will cause catastrophic failure. Always ensure your using the proper cartridge for your rifle.
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(337) 353-8427