Liberty Ammunition OverWatch .357 Magnum 70grain Open Cavity Design Nickel Plated Brass Cased Pistol Ammo 20 Rounds. After testing Civil Defense these groups were impressed by the way the projectile erupts upon impact. The only concern was the lack of penetration. Liberty Ammunition addressed this issue OVERWATCH projectiles are designed to function similarly to Civil Defense projectiles but offer increased weight for deeper penetration. Capable of penetrating 12in-16in in gel blocks the Overwatch lineup prioritizes Maximum Organ Displacement or MOD. As always Overwatch ammunition projectiles are crafted from solid copper alloy Specifications for Liberty Ammunition OverWatch .357 Magnum 70grain Open Cavity Design (OCD) Nickel Plated Brass Cased Pistol Ammunition: Manufacturer: Liberty Ammunition Caliber: .357 Magnum Number of Rounds: 20 Bullet Type: Open Cavity Design (OCD) Bullet Weight: 70 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1830 ft/s Muzzle Energy: 520 ft-lbs Application: Home Defense Package Type: Box Primer Style: Centerfire Lead Free: Yes Package Contents: Liberty Ammunition OverWatch .357 Mag 70 Grain Hollow point Brass casing - Black Nickel Casing Cased Pistol Ammunition Liberty Ammunition LA-OW357-70-1830: OverWatch .357 Mag 70 Grain Hollow point Brass Cased Pistol Ammo 20 Rounds