The website
http://www.quarry.nildram.co.uk/WW2guneffect.htm is really a nice overview.
Furthermore, I see things similar like tools4fools concerning the destructive potential of the .303 ammo. Planes can´t always explode after you hit em with a 3 second burst like i nsoem historical WW2 guncam footage. It´s often enough to hit the engine of a german bomber without seeing flames or explosions. Mostly ,some mintues later the engine stops workign after you have pounded the engines. Why should one waste additional bullets into a target which is very likely to go down short time later.
This really helps you saving ammo concerning bombers and you can bring down 3-5 bombers after 15 minutes over the channel or England.
In regards to ripping of wings, I have since several days the impression in that case convergence matters the most, since you can rip it of at 200m with a 220yards convergence setup with a short burst at the right stop but despair at close range (50m) while pumping bullets into the bomber which doesn´t expldoe or loses its wing. Apparently, it appears to me, that the convergence is the key or main factor for such wing-off enterprises
.