'Ere's a few thots about the stopping power (SP rating) of yer 'uman being. The average human being has a body of 6 and therefore a BTM of 2. The average 9mm slug will do between 2d6+1 and 2d6+2 depending on what system yer using. So we gives our average 'uman an SP rating of 8, which means the average 9mm slug will 'ave expended all it's energy before penetrating the, er, back of our average joe. SP = Body + |BTM| PLEASE NOTE THAT THIS IS NOT SP APPLIED TO THE DAMAGE THE ROUND DOES TO THE TARGET, BUT IS THE AMOUNT OF SP THE INITIAL TARGET PROVIDES FOR PEOPLE STANDING BEHIND HIM OR HER Purty simple, eh? Big-ass galoots with super-human bodies (BODY 12) get a whopping -5 BTM. That means they have an SP rating of 17! But doncha be fergettin' about their body armor. For a round to do damage after penetrating someone, it has to also penetrate his or her body armor AGAIN. Example: I shoot Fred here in the chest with an electrothermically enhanced Malorian firing DPU ammo... that does some big ass damage... something like 50 points. Fred is wearing a Light Armor Jacket (SP:14) left over from before he bought his Chrome Book 4 armor (don't wanna be plugging holes in his good duds, ya know) and is Body 8 (BTM3). The slug hits his jacket and the jacket stops 7 points of damage (DPU is considered Armor Piercing), leaving poor Fred to take 43 points. He only takes 19 after his BTM and the Armor Piercing effectstake effect, plummeting him down through Light, Serious, Critical and into Mortal 1 (sorry Fred). Now George is standing behind Fred, well, with a firedoor between them (SP20) and is wearing a Heavy Armor Jacket (SP20). The DPU slug has to penetrate Fred's armor twice (once going in, once coming out), Fred, the door and then George's jacket before hurting George. 50 damage, minus the jacket (7) twice (14), minus Fred (½11=5.5), minus the firedoor (½20=10), minus the Hvy Armor Jacket (½20=10). That leaves the slug still doing 10.5 damage to George, 6 points after AP effects.