Atomic Rifle Ammunition Features Atomic Ammunition s .223 Rem load is built around a 77 grain hollow point boat tail bullet a heavier-than-standard weight chosen specifically to stay subsonic when fired through a suppressed rifle. Staying below the speed of sound eliminates the supersonic crack that would otherwise accompany a faster .223 Rem round giving suppressed shooters a genuinely quiet report. The boat tail design reduces drag as the bullet travels downrange helping it retain velocity and maintain accuracy at extended distances despite its reduced muzzle velocity. The hollow point profile is built to expand reliably on impact giving the round practical terminal performance despite its subsonic design. Each round is loaded in brass casing a material trusted for consistent extraction dependable primer seating and overall reliable function across a wide range of rifles. The 20 round box size gives shooters a manageable quantity for range testing a new suppressor setup or dialing in a subsonic load for a specific rifle. Atomic Ammunition built this load specifically to answer the growing demand for dependable subsonic .223 Rem ammunition among suppressor owners. The Atomic Ammunition .223 Rem 77 grain HPBT load gives shooters a purpose-built option for quiet accurate suppressed rifle performance. Atomic Rifle Ammunition Specifications Manufacturer: Atomic Caliber: .223 Rem Bullet Weight: 77 gr Bullet Type: Hollow Point Boat Tail Rounds Per Box: 20 Case Material: Brass Muzzle Velocity: 1050 fps Available At: GrabAGun