The Remington Subsonic .300 AAC Blackout 220-grain Open Tip Flat Base (Remington part no. 28430) is loaded specifically to stay below the speed of sound for suppressed AR-pattern rifles. At 940 fps, it’s comfortably subsonic even accounting for velocity variance, and the open-tip flat-base bullet is engineered to still expand reliably at these reduced velocities, where many conventional expanding bullets fail to open up at all. 300 Blackout was purpose-built to give AR-15 shooters full-power supersonic performance and a genuinely effective subsonic option from the same magazine and bolt carrier group. This is a strong choice for suppressor-equipped hunting or home-defense rifles.

Key Specifications

• Chambered in .300 AAC Blackout, a cartridge purpose-built to run both supersonic and subsonic loads through a standard AR-15 platform.
• The 220-grain bullet weight is heavy for caliber, which is what lets it stay subsonic while still carrying real downrange energy.
• Bullet construction is Open Tip Flat Base (OTFB), engineered to expand reliably even at the reduced velocities subsonic loads run at, where many expanding bullets fail to open.
• Muzzle velocity is rated at 940 fps, comfortably below the speed of sound for quiet, reliable suppressed shooting.
• This is Remington’s dedicated Subsonic product line, tuned specifically for suppressor use.
• Cases are brass, standard for reloading and reliable ignition.
• It ships 20 rounds to a box, the standard count for this Subsonic loading.
• Cost works out to about $1.60 per round, reasonable for a purpose-built subsonic hunting load.
• 300 Blackout’s case is built off the 5.56 NATO case body, so it feeds through the same magazines and bolt as a standard AR-15.

Frequently Asked Questions

Is this ammunition subsonic? Yes — at 940 fps it’s comfortably below the speed of sound, built specifically for suppressed shooting.

Will this bullet expand at subsonic velocity? Yes — the OTFB design is engineered to still open reliably at subsonic speeds, where many conventional expanding bullets fail to fully deploy.

How many rounds come in a box? Each box holds 20 rounds.

Buy the Remington Subsonic .300 AAC Blackout 220gr OTFB

For a suppressed AR running quiet, a subsonic load that still expands on impact is worth the premium. Order it from our Remington lineup at our Lubbock, Texas gun shop and it ships fast to your door, or browse the full rifle ammunition selection for more 300 Blackout options.