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Availability: In Stock
Underwood Ammo 419 Custom Competition 300 Blackout ammunition is purpose-built for shooters who run suppressors and demand consistent, subsonic performance. Loaded with a 220-grain hollow point boat tail bullet at 1030 feet per second, this match-grade round stays subsonic across the board—no transonic surprises—making it the go-to choice for suppressed bolt guns, precision AR pistols, and competition rigs where quiet and reliable downrange behavior matter. The nickel-plated brass cases are reloadable and non-corrosive, so you can run hard and reload hard.
Built on Underwood's competition-grade standards, these rounds combine a 0.308 diameter copper-lead projectile with a ballistic coefficient of 0.69 and exceptional sectional density (0.331), delivering the kind of stability and penetration you expect from match ammunition. At 518 foot-pounds of muzzle energy, they're more than adequate for hunting applications and self-defense scenarios, but they truly shine where accuracy and suppressor compatibility are non-negotiable. The hollow point design promotes controlled expansion on impact.
This is working ammunition for serious shooters: new production, boxer-primed, loaded 20 rounds per box. Order by the case and you've got the consistency and volume to dial in your load, train without interruption, or stock a suppressed platform that demands predictable subsonic performance. Whether you're dialing in a precision rifle or running suppressed duty ammunition, Underwood's 419 Custom Competition delivers the ballistic discipline you need.
| Caliber | .300 AAC Blackout (7.62x35mm) |
| Bullet Weight | 220 grains |
| Bullet Diameter | 0.308 |
| Bullet Type | Hollow Point Boat Tail |
| Muzzle Velocity | 1030 feet per second |
| Muzzle Energy | 518 foot-pounds |
| Ballistic Coefficient (G1) | 0.69 |
| Sectional Density | 0.331 |
| Case Material | Nickel-Plated Brass |
| Primer | Boxer, Non-Corrosive |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
| Manufacturer | Underwood Ammo |
Yes. The 419 Custom Competition 300 Blackout is specifically designed to be suppressor-safe and performs reliably with sound suppressors.
The 220-grain bullet exits at 1030 feet per second, which is below the speed of sound (~1125 fps at sea level). This keeps the round quiet when suppressed and eliminates supersonic crack, making it ideal for precision and stealth applications.
Yes. The ammunition comes loaded in reloadable, non-corrosive boxer-primed nickel-plated brass cases, so you can reload and reuse them.
Each case contains 10 boxes of 20 rounds each, for a total of 200 rounds of loaded ammunition per case.
SKU: 194200393 • Width: 2.5in • Height: 1in • Depth: 5in • Weight: 1oz
Availability: In Stock
Underwood Ammo 419 Custom Competition 300 Blackout ammunition is purpose-built for shooters who run suppressors and demand consistent, subsonic performance. Loaded with a 220-grain hollow point boat tail bullet at 1030 feet per second, this match-grade round stays subsonic across the board—no transonic surprises—making it the go-to choice for suppressed bolt guns, precision AR pistols, and competition rigs where quiet and reliable downrange behavior matter. The nickel-plated brass cases are reloadable and non-corrosive, so you can run hard and reload hard.
Built on Underwood's competition-grade standards, these rounds combine a 0.308 diameter copper-lead projectile with a ballistic coefficient of 0.69 and exceptional sectional density (0.331), delivering the kind of stability and penetration you expect from match ammunition. At 518 foot-pounds of muzzle energy, they're more than adequate for hunting applications and self-defense scenarios, but they truly shine where accuracy and suppressor compatibility are non-negotiable. The hollow point design promotes controlled expansion on impact.
This is working ammunition for serious shooters: new production, boxer-primed, loaded 20 rounds per box. Order by the case and you've got the consistency and volume to dial in your load, train without interruption, or stock a suppressed platform that demands predictable subsonic performance. Whether you're dialing in a precision rifle or running suppressed duty ammunition, Underwood's 419 Custom Competition delivers the ballistic discipline you need.
| Caliber | .300 AAC Blackout (7.62x35mm) |
| Bullet Weight | 220 grains |
| Bullet Diameter | 0.308 |
| Bullet Type | Hollow Point Boat Tail |
| Muzzle Velocity | 1030 feet per second |
| Muzzle Energy | 518 foot-pounds |
| Ballistic Coefficient (G1) | 0.69 |
| Sectional Density | 0.331 |
| Case Material | Nickel-Plated Brass |
| Primer | Boxer, Non-Corrosive |
| Rounds Per Box | 20 |
| Boxes Per Case | 10 |
| Manufacturer | Underwood Ammo |
Yes. The 419 Custom Competition 300 Blackout is specifically designed to be suppressor-safe and performs reliably with sound suppressors.
The 220-grain bullet exits at 1030 feet per second, which is below the speed of sound (~1125 fps at sea level). This keeps the round quiet when suppressed and eliminates supersonic crack, making it ideal for precision and stealth applications.
Yes. The ammunition comes loaded in reloadable, non-corrosive boxer-primed nickel-plated brass cases, so you can reload and reuse them.
Each case contains 10 boxes of 20 rounds each, for a total of 200 rounds of loaded ammunition per case.
SKU: 194200393 • Width: 2.5in • Height: 1in • Depth: 5in • Weight: 1oz