QUOTE (Bugfoxmaster @ Sep 1 2009, 12:39 PM)

Wait, what? I'm missing what you mean, I think... The body is the DV? Huh?
Anyways, you're right, I forgot the armor vest has plates on the back too, but it seems sort of ridiculous to make the barrier rating the ballistic armor DOUBLED plus the body... That'd make through-and-throughs all but impossible. I also can't see ignoring the person's armor, or the body itself... finally, the barrier rating would have to be at least as high as the armor, because the bullet can't penetrate the armor unless the DV is higher than the ballistic rating. Maybe it could just be armor * 2 +Body? That seems a little too high though, even though it might be possible with a callet shot to somewhere without armor...
It makes
sense for this to be nigh impossible. You're asking a bullet to penetrate something that's designed to stop it, maintain velocity through a body (bone, liquid, tissue - all represent significant drag and will slow your bullet down considerably), then penetrate the armor
again,
and maintain sufficient velocity to penetrate any armor present on the second target, while preserving enough velocity to do damage after that.
There's a reason that you don't see through-and-throughs on people wearing ballistic armor in the real world (excluding VERY large guns) - this is something that SHOULD be functionally impossible without hitting some unarmored area. As a side note, even if it weren't for armor, deflection of the bullet's trajectory upon interaction with a body is almost impossible to predict, so it's a tough shot to make in the first place.
Thus, in the end, the answer is clearly just to use a Direct Area offensive spell