The 17 pounder in the Firefly was a devastating weapon. The problem with hitting a WW or OW turret and having nothing happen, is that the gun mount is smack in the middle. Hitting that mount will definitely set off an AP round.
A 75mm causes stuff like this to happen...
This Pz IV was destroyed by a T-34/76
This StugIII was killed by a Firefly near Arnhem. The AP round went straight through. Didn't blow up, but the concussion killed everyone inside.
This Panzer IV was killed by a 47mm French gun...not even a 75mm.
This is what happens to a T-34 when hit with a 75mm.
I realize there's some playability issues that have to be considered...it is a game...but hitting damn near anything with a Tiger, usually results in a dead target. Hitting a WW, Pz IV, Sherman, or T-34 (especially the T-34/76), as long as it's not a glancing shot, was usually fatal. The brute force of the 88mm hitting the target usually disassembled the target...kinda like hitting an apple with a sledgehammer.
Jeff
(who does this crap for a living)