The Atomic .223 Remington 77gr HPBT Subsonic (brand part no. 00497) is a purpose-built subsonic training load pairing a heavy 77-grain hollow point boat tail bullet with a muzzle velocity that stays below the speed of sound for quiet, suppressed AR-15 practice. Atomic builds this load specifically for suppressed close-range training and practice rather than hunting or defensive use, keeping report and recoil low for extended range sessions. Among our rifle ammunition, this Atomic subsonic load suits AR-15 owners running a suppressor who want quiet, low-report practice ammo.

Key Specifications

• The chambering is .223 Remington.
• The bullet weight is 77 grains.
• The bullet is a hollow point boat tail (HPBT).
• The muzzle velocity is subsonic, built for suppressed shooting.
• Purpose-built for suppressed training and practice, not defensive use.
• Each box holds 20 rounds.

Frequently Asked Questions

Is this ammo actually subsonic? Yes, Atomic builds this load specifically to stay below the speed of sound for quiet, suppressed shooting.

Is this a defensive round? No, this is a training and practice load built for quiet suppressed range sessions, not a defensive round.

How many rounds are in this box? This listing is a single 20-round box.

Buy Atomic .223 Remington Subsonic Ammo

Quiet, suppressor-optimized .223 practice ammo with a heavy 77-grain HPBT bullet is exactly what this Atomic subsonic load delivers. Order it from our Lubbock, Texas gun shop and we’ll get it to you as soon as it’s ready to ship.