wasnt a rocket fired from there and not a shell???
:hmm:
"Primary
armament 380 mm RW61 L/5.4 rocket mortar"
ps the specs for the first tank the Panzer 8 Maus
Primary
armament 128 mm KwK44 L/55 Secondary
armament
co-axial 75 mm KwK 44 L/36.5 
7.92 mm MG34