Every hitbox has a different damage multiplier.
The reason you have to aim for the head and chest :
Shoulder and upper arm: x0.7
Forearm and wrist: x0.5
Thigh (upper leg): x0.8
Leg (lower leg): x0.6
Trivia & Tips
- Shotguns shots are instakills, but they have very low armor penetration. Limbshots are recommended, because armor affects only main body areas, but there is a skill (ARMOR PLATES FOR LIMBS) which protects limbs for 20% of the incoming damage. Headshots are still the best.
- Shooting someone in the very low leg and fingers does no damage; but there is still blood.