War Thunder - Sherman IC Trzyniec (Firefly) Gameplay

Using the premium Sherman IC Trzyniec (Firefly) in War Thunder - Battlerating 4.7.
This Sherman is equipped with the British 17 pounder gun. Which has almost unmatched penetration values at the battlerating of 4.7. However, it only fires AP ammo, without any explosive filler. This makes it necessary to aim at crewmembers or ammo preferably.