Underwood Ammo 419 Custom Competition 300Blackout 220gr Hollow Point Boat Tail Match 20 Per Box/10 Case

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.

Key Features

• Subsonic performance at 1030 fps—stays below the sound barrier reliably
• Suppressor-safe hollow point design for controlled expansion
• Reloadable nickel-plated brass cases, non-corrosive boxer primers
• Match-grade ballistic coefficient (0.69 G1) for stable flight and minimal drift
• New production, quality-controlled ammunition
• Effective for hunting and self-defense applications

Specifications

Frequently Asked Questions

Is this ammunition safe to use in a suppressor?

Yes. The 419 Custom Competition 300 Blackout is specifically designed to be suppressor-safe and performs reliably with sound suppressors.

What makes this round subsonic?

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.

Can I reload these brass cases?

Yes. The ammunition comes loaded in reloadable, non-corrosive boxer-primed nickel-plated brass cases, so you can reload and reuse them.

What's included in a case order?

Each case contains 10 boxes of 20 rounds each, for a total of 200 rounds of loaded ammunition per case.