Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77grain Boat Tail Hollow Point Brass Cased Rifle Ammo 20 Rounds. 56 NATO 77gr Cycling HP BT defensive round built on the 77gr OTM profile that set the standard for 5.56 terminal performance. Purpose-built for home defense duty carry and 3-Gun delivering sub-MOA accuracy superior terminal effect and better barrier performance than standard ball ammunition. The AD77 is Atomics purpose-built 77gr OTM (Open Tip Match) defensive load for the AR-15 platform. The 77gr boat tail profile is the benchmark for precision 5.56 engagement selected for its superior accuracy terminal effect and barrier performance over standard 55gr and 62gr ball ammunition. Atomic loads it to a higher standard. Every AD77 round is built with new-production brass match-grade 77gr HP BT projectiles and precision-weighed powder charges inspected for the tight tolerances required to deliver sub-MOA accuracy and consistent 2750 fps muzzle velocity across every lot. Heavier bullet higher ballistic coefficient. That means less wind drift more energy retained at distance and effective terminal performance out past 600 yards. The hollow point boat tail provides controlled expansion while reducing deflection through intermediate barriers like drywall and auto glass. The 77gr OTM isnt new its the spec that proved what 5.56 could do when loaded right. The AD77 is Atomics answer to how it should be loaded. Built for: Home defense duty carry and 3-Gun competition. Optimized for 1:7 and 1:8 twist barrels. Specifications for Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77grain Boat Tail Hollow Point Brass Cased Rifle Ammunition: Manufacturer: Atomic Ammunition Caliber: 5.56x45mm NATO Bullet Type: Boat Tail Hollow Point (BTHP) Bullet Weight: 77 grain Cartridge Case Material: Brass Muzzle Velocity: 2750 ft/s Muzzle Energy: 1294 ft-lbs Application: Self-Defense Features of Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77grain Boat Tail Hollow Point Brass Cased Rifle Ammunition Origin America Platform Rifle Caliber 5.56 NATO Bullet Weight 77gr Bullet Type Boat Tail Hollow Point Case Material Brass Muzzle Velocity 2750 fps Muzzle Energy 1294 ft-lbs Application 3-Gun Duty Use Home Defense Accuracy Sub-MOA Subsonic No Package Contents: Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77grain Boat Tail Hollow Point Brass Cased Rifle Ammunition What is Atomic Ammunition Cycling Defense AD77 5.56x45mm NATO 77grain Boat Tail Hollow Point Brass Cased Rifle Ammunition good for? The manufacturer suggests that it is suitable for self-defense.Atomic Ammunition CART-556-77GR-HPBT-DEF-20: Cycling Defense AD77 5.56x45mm NATO 77grain Boat Tail Hollow Point Brass Cased Rifle Ammo 20 Rounds