Um...looking back over that, I kinda messed up. That isn't the right damage. in fact, it isn't even close.
I forgot to convert Kilograms into Grams. Therefore, tack on another 3 zeros to the end of the damage results.
My bad.
(Not bad physics for a Theatre Major, though, eh?)
EDIT: And I think I'll sig that to commenmerate my accomplishment.