Buy 223 subsonic ammo from Atomic Ammunition. Our 77gr HP BT subsonic load lets you run your AR-15 with a suppressor at hearing-safe noise levels — no ear protection needed. While .223 Remington isn’t a natural subsonic caliber, the heavy 77gr bullet at 1,050 fps eliminates the supersonic crack that makes standard .223 so loud, even with a can. This is 223 suppressor ammo for shooters who want the quietest possible AR-15 experience.
Subsonic .223 is a niche load with a specific purpose: maximum noise reduction on the AR-15 platform. At 1,050 fps with a suppressor, you get hearing-safe shooting (under 125 dB) without the punishing crack of standard 5.56. The 77gr HP BT maintains good accuracy at close range (inside 100 yards). Note: subsonic .223 will not reliably cycle semi-auto gas systems — this is a bolt-action or single-shot load. For shooters with bolt-action .223s or AR-15s with suppressor-optimized uppers, it’s a uniquely quiet training experience.
American-Made Components & Quality
Loaded with American-made components: new brass cases, precision-weighed powder charges, and 77gr HP BT projectiles. Hand-inspected to Atomic’s standards. 100% American-made, no imports.
Frequently Asked Questions
Will this cycle my AR-15?
Subsonic .223 does not generate enough gas pressure to cycle standard AR-15 gas systems. This load is best suited for bolt-action rifles or manual cycling. Consider .300 Blackout subsonic for reliable semi-auto cycling.
What twist rate do I need?
1:7 or 1:8 twist is required to stabilize the heavy 77gr bullet. Most modern AR-15 barrels have 1:7 or 1:8 twist.
Is this ammo suppressor safe?
Yes. Loaded to 1,050 fps, well below the speed of sound.
Is the brass reloadable?
Yes. New boxer-primed brass, fully reloadable.
What is the minimum order?
Minimum order is 100 rounds. Bulk discounts on 200+ rounds.
