Atomic Ammunition 300 Blackout Subsonic 220gr HPBT Rifle Rounds - 50 Box / 10 Case

Atomic Ammunition 300 Blackout subsonic 220gr HPBT rounds deliver the suppressed-host performance that modern .300 Blackout shooters demand. Built around a heavy 220-grain hollow point boat tail bullet, these cartridges are engineered to cycle reliably through AR-platform rifles while staying subsonic—a critical advantage for hunters and shooters running sound suppressors who want reliable expansion and controlled velocities. Whether you're hunting hogs at close range, suppressing nuisance problems on your land, or running subsonic drills at the range, this is ammunition that balances practicality with real stopping authority.

The 220-grain bullet weight is the sweet spot for .300 Blackout subsonic loads: heavy enough to hit hard and expand, light enough to maintain stable flight from both 16-inch and pistol-length barreled builds. The hollow point design promotes controlled expansion on game and barriers, while the boat tail profile helps with ballistic efficiency downrange. Atomic loads these rounds to subsonic velocity, meaning they stay below the sound barrier and work best with a suppressor, though they'll cycle any semi-auto .300 Blackout rifle reliably.

This is a full case buy—ten 50-round boxes totaling 500 rounds—so you get serious volume for your dedicated .300 Blackout setup without breaking up bulk quantities. Ideal for hunters, suppressor shooters, and range regulars who've committed to the platform and want consistent, quality ammunition they can rely on.

Key Features

• 220-grain hollow point boat tail bullet for controlled expansion and reliable feeding
• Subsonic velocity ideal for suppressed .300 Blackout rifles
• Full 500-round case (10 boxes of 50) for dedicated shooters and hunters
• Engineered for reliable function in semi-automatic AR-platform rifles

Specifications

Frequently Asked Questions

Will these rounds cycle in my .300 Blackout AR?

Yes. These 220-grain subsonic loads are designed to function reliably in semi-automatic .300 Blackout rifles, including 16-inch and pistol-length barreled builds.

Are these loaded to subsonic velocity?

Yes. These rounds are loaded subsonic, meaning they stay below the sound barrier. This is the primary advantage of subsonic ammunition when used with a suppressor.

What are these rounds best used for?

The 220-grain weight and hollow point design make them suitable for hunting, pest control, and suppressed shooting applications where you want reliable expansion and controlled velocity in a .300 Blackout.

How much ammunition is in a case?

Each case contains 500 rounds—10 boxes of 50 rounds each.