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.223 Rem 77gr HP BT Subsonic
Price range: $112.50 through $900.00 — or from Price range: $101.25 through $810.00 / month
Atomic Ammunition .223 Rem 77gr HP BT subsonic ammo turns your AR-15 into a whisper-quiet suppressed platform for training and close-range practice.
Caliber.223 Rem
Bullet Weight77gr
Bullet TypeHollow Point, Boat Tail
Muzzle Velocity1,050 fps
Muzzle Energy189 ft-lbs
Sound Reduction30-40 dB w/ Suppressor
ApplicationSuppressed Training, Quiet Practice
Case MaterialBrass
American-made — bulk discounts available
Ammunition orders typically ship within 7-10 business days of purchase.
Atomic Ammunition's .223 Rem 77gr subsonic ammo is built for suppressed AR-15 training and quiet close-range practice. The hollow point boat tail load stays below the sound barrier to cut the crack of standard .223 while preserving practical accuracy for low-noise rifle work.
Subsonic Performance & Applications
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.
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| Count | 100, 200, 500, 1000 |
| Platform | Rifle |
| Caliber | .223 Rem |
| Bullet Weight | 77gr |
| Bullet Type | Boat Tail, Hollow Point |
| Muzzle Velocity | 1,050 fps |
| Muzzle Energy | 189 ft-lbs |
| Sound Reduction | 30-40 dB w/ Suppressor |
| Application | Quiet Practice, Suppressed Training |
| Case Material | Brass |
| Subsonic | Yes |
| Origin | America |
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