HK4.6x30 Overview The  HK 4.6×30mm cartridge is a type of ammunition primarily used in the Heckler & Koch MP7 Personal defense weapon (PDW). It is designed to minimize weight and recoil while increasing penetration of body armor. It features a bottlenecked case and a pointed, steel-core, brass-jacketed bullet.   Stats Ammunition Type Damage Bullet Velocity (m/s) Barrier Penetration Armor Piercing DM11 GPR 6 725 1.54 5 DM31 AP 5.9 660 1.67 6 AP SX 6.2 680 2.1 8 Action SX 9 690 0.2 1 Subsonic SX 6 290 0.15 6 DE (Dual Environment) 5.67 700 2.1 5 DM41 AP 4.9 922 5.2 16 Note: Barrier penetration represents the rounds ability to go through walls and barriers. Armor piercing represents the rounds ability to penetrate body armor plates.