QUOTE (Udoshi @ Jul 27 2010, 11:25 PM)

No, no, thats the entire -point- of the barrier rules. It doesn't need to reduce it to zero, it just needs to reduce it enough for the damage of the round to exceed the armor(and thus go through. Also, important clarification: Exceed, not equal or exceed.) What you're aruing is that an APDS round fired through a wall magically stops being an APDS penetrator round designed to go through stuff as soon as it goes through a piece of plywood.
No, what I'm arguing is that an APDS round that goes through a plywood barrier is going to be
less able to penetrate armor than an APDS round that
has not gone through any sort of hindrance. I'm not saying that the bullet should stop if it can't reduce the armor of the barrier to 0, I'm just saying that it no longer has the force required to reduce the armor of anything else.
So, and APDS round with -5 AP that goes through a 2 armor plywood barrier would have used up enough kinetic energy that it only retains enough power to reduce future armor (such as on a target or another barrier) by 3. In other words, the bullet doesn't magically gain more kinetic energy after passing through a barrier. This prevents all the stupid stuff that people keep finding like being able to go through an infinite number of walls, a wall providing less protection if there is a weaker wall behind it, and so on.
So sure, if your bullets are made of unobtainum and propelled by handwavium, then go ahead and keep apply full AP over and over and over again to each barrier, regardless of the loss of kinetic energy and the deformation of the bullet that would occur with each barrier it passes.
Oh, and no, I wasn't saying that you were thinking that the AP applied to the barrier, then the bonus armor, then the person's real armor, what I was saying was that if the target had no armor, then the second application of the AP that you wanted, would then knock off bonus armor that was provided by virtue of the fact that the AP wasn't sufficient to reduce the armor of the barrier, in other words it got to hit the armor of the barrier twice if the target wasn't wearing armor (or was only lightly armored)