Stage Two, a British TD based on the Centurion tank, using a monstrous 183 mm cannon to decimate with HESH. In fire range testing on a decommissioned Conqueror, a single HESH rounds cracked its mantlet! That's 254 mm of armour spalling capability!
The Panzerjäger Tiger (P) Ferdinand/Elefant was a limited production lumbering beast, but with one mighty sting. Armed with arguably the best tank killing gun of in the Pak the Ferdinand/Elefant could truly reach its opponent out of touch.