Oh, wait, KOM is supposed to be added too, it's just that half your strength modifier is added anyway. I didn't realise because KOM and KDM take up all of one paragraph.
Make that another 4 damage on top of the +3 from [Brutal 2]. So, that's 15 damage now, I think?
EDIT: If I start carrying around another weapon, it'll be a Chainsaw for [Brutal 3] and I'm adding [Reach] and [React] to it. Sure, Magnum gives nice damage, but I
like being in melee. Lets me use Heavy Metal, for instance.