I've got to say that I'm honestly not sure how the game handles the multiple rockets of the Mitchell (EU default). For example I have killed two guys that were standing close together, because, and I can only assume this, the rockets hit both of them. I do not believe that against armor it registers as several smaller rockets each doing their own damage but as a whole. Of course, this would be very hard to test, as how do you make only one or two of the four hit something but not the others? Also I believe that when one hits something, it set all of the missiles off.
As for the stats on damage I believe that mine are the only ones that have been posted in this thread (which are all empirically based) and I still stand behind them. They can be found
here.