Underwood Ammo194200393
Underwood Ammo 419 Custom Competition 300Blackout 220gr Hollow Point Boat Tail Match 20 Per Box/10 Case$34.73
Availability: In Stock
Underwood Ammo's 951 Custom Competition 8.6 Blackout ammunition delivers subsonic performance built specifically for suppressed rifles and controlled competition shooting. Loaded with a 300-grain hollow point boat tail bullet over nickel-plated brass cases, this round is engineered for consistent accuracy at subsonic velocity—950 fps from a 12-inch test barrel—making it ideal for shooters who run suppressors and demand reliable, repeatable ballistics without supersonic crack. Whether you're running precision rifle matches, testing loads for a new suppressed build, or training with subsonic rounds, the 951 provides the predictable performance serious shooters expect.
The hollow point boat tail design offers a balance of expansion potential and aerodynamic stability. Copper-lead construction delivers the penetration and performance characteristics match-tested rounds demand, while the subsonic velocity rating ensures your suppressor does its job without the bullet breaking the sound barrier and compromising noise reduction. Each box contains 20 rounds, with 10 boxes per case for those stocking up.
This is ammunition built by shooters for shooters—not a generic surplus load. Underwood focuses on delivering consistent velocity, reliable feeding, and accuracy that translates to the range. If you're running a suppressed 8.6 Blackout and want factory ammunition that performs predictably, the 951 Custom Competition round is worth running.
| Cartridge | 8.6 Blackout |
| Bullet Weight | 300 grains |
| Bullet Type | Hollow Point Boat Tail |
| Bullet Material | Copper Lead |
| Case Type | Nickel Plated Brass |
| Muzzle Velocity | 950 fps (12" test barrel) |
| Muzzle Energy | 601.6 ft-lbs |
| Velocity Rating | Subsonic |
| Suppressor Safe | Yes |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
Yes. The 951 Custom Competition load runs 950 fps from a 12-inch barrel, keeping the bullet subsonic (below roughly 1,125 fps depending on temperature and altitude). This means it won't produce the supersonic crack that undermines suppressor effectiveness. It's designed specifically for shooters running suppressors.
The hollow point provides expansion potential and controlled penetration, while the boat tail rear improves aerodynamics and ballistic coefficient for more stable flight. This combination is popular in precision and competition ammunition where accuracy and terminal performance both matter.
Each case contains 10 boxes of 20 rounds each, for a total of 200 rounds per case of 8.6 Blackout ammunition.
Technically yes—it's safe to shoot in any 8.6 Blackout rifle. However, subsonic ammunition is specifically optimized for suppressed fire. If you're not running a suppressor, you may get better results with standard-velocity loads.
SKU: 194200392 • Width: 3in • Height: 2in • Depth: 6in • Weight: 1.5oz
Availability: In Stock
Underwood Ammo's 951 Custom Competition 8.6 Blackout ammunition delivers subsonic performance built specifically for suppressed rifles and controlled competition shooting. Loaded with a 300-grain hollow point boat tail bullet over nickel-plated brass cases, this round is engineered for consistent accuracy at subsonic velocity—950 fps from a 12-inch test barrel—making it ideal for shooters who run suppressors and demand reliable, repeatable ballistics without supersonic crack. Whether you're running precision rifle matches, testing loads for a new suppressed build, or training with subsonic rounds, the 951 provides the predictable performance serious shooters expect.
The hollow point boat tail design offers a balance of expansion potential and aerodynamic stability. Copper-lead construction delivers the penetration and performance characteristics match-tested rounds demand, while the subsonic velocity rating ensures your suppressor does its job without the bullet breaking the sound barrier and compromising noise reduction. Each box contains 20 rounds, with 10 boxes per case for those stocking up.
This is ammunition built by shooters for shooters—not a generic surplus load. Underwood focuses on delivering consistent velocity, reliable feeding, and accuracy that translates to the range. If you're running a suppressed 8.6 Blackout and want factory ammunition that performs predictably, the 951 Custom Competition round is worth running.
| Cartridge | 8.6 Blackout |
| Bullet Weight | 300 grains |
| Bullet Type | Hollow Point Boat Tail |
| Bullet Material | Copper Lead |
| Case Type | Nickel Plated Brass |
| Muzzle Velocity | 950 fps (12" test barrel) |
| Muzzle Energy | 601.6 ft-lbs |
| Velocity Rating | Subsonic |
| Suppressor Safe | Yes |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
Yes. The 951 Custom Competition load runs 950 fps from a 12-inch barrel, keeping the bullet subsonic (below roughly 1,125 fps depending on temperature and altitude). This means it won't produce the supersonic crack that undermines suppressor effectiveness. It's designed specifically for shooters running suppressors.
The hollow point provides expansion potential and controlled penetration, while the boat tail rear improves aerodynamics and ballistic coefficient for more stable flight. This combination is popular in precision and competition ammunition where accuracy and terminal performance both matter.
Each case contains 10 boxes of 20 rounds each, for a total of 200 rounds per case of 8.6 Blackout ammunition.
Technically yes—it's safe to shoot in any 8.6 Blackout rifle. However, subsonic ammunition is specifically optimized for suppressed fire. If you're not running a suppressor, you may get better results with standard-velocity loads.
SKU: 194200392 • Width: 3in • Height: 2in • Depth: 6in • Weight: 1.5oz