Atomic Ammunition Atomic Ammo .40sw 180gr. Bonded Jhp 20-pack. These bullets regularly expand to .70 inches retain 99percent of their original mass and penetrate more than 15 inches of ballistic medium. Specifications for Atomic Ammunition Atomic Ammo .40sw 180gr. Bonded Jhp 20-pack: Manufacturer: Atomic Ammunition Caliber: .40 S&W Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 180 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1100 ft/s Primer Style: Centerfire Dimensions: 1.50 X 2.65 X 3.25 in Package Contents: Atomic Ammunition Atomic Ammo .40sw 180gr. Bonded Jhp 20-pack