F.A.Q. : How does weapon penetration work?
Projectile damage is not diminished after penetrating through something.
Projectiles can only penetrate through one wall.
Projectiles cannot penetrate through a tank.
The Shotguns can penetrate through any number of infecteds, then hit two more infected after penetrating a wall.
The Hunting Rifle can penetrate through any number of infected before and after penetrating a wall.
The other weapons can only penetrate through one wall OR one infected.
Projectiles can not deal any Friendly Fire after penetrating through a wall.
Shotguns and Hunting Rifles can deal Friendly Fire after penetrating through living creatures. The other weapons (M16, Pistols & Uzi) are safe.