Targeting a particular part of the body is a Called Shot. The modifier to the attack roll depends on the Scale of the target itself (not the creature it’s part of). Use the Scale Modifiers table to determine any bonus or penalty for the target’s Scale. These modifiers are already listed in parentheses below for Normal scale creatures, along with any specific game effects:
HAND (−4): Target may be Disarmed, see page 94.
HEAD OR VITALS (−4): Hitting the head or vital organs of living creatures adds +4 damage to the attacker’s total. The penalty is −5 if attempting to target the face of someone wearing an openfaced helmet (thus bypassing the helmet’s Armor).
ITEM (?): Use the dimensions on the Scale table for items. Targeting something the size of a pistol, for example, is −4; a 3' long sword is −2.
LIMBS (−2): Hitting a limb has no additional special effect since it’s already accounted for by Wound and Pace penalties (see Wounds, page 89).
UNARMORED AREA (?): The attack targets the unprotected area of a target otherwise covered in Armor. The penalty depends on the Scale of the area. The eyeslit of a helmet is Tiny (−6), for example, while the flesh beneath the missing scale of a Huge dragon might be Very Small (−4).
Use the Scale of the target when making called shots against creatures, not their Scale. If a hero wants to blast the eye of a Huge robot destroying the city, for example, use the Scale of the eye, not the robot. If the eye is about the size of a car, the hero adds +2 to his roll because a car is Large, a +2 bonus.