That is a high capacity mine shell which is very different from a modern shell (or *most* shell types of that period).

20mm MGFFM and 20mm MG151/20 fired:
conventional HEI shells 115g, with 3.7g of HE
mine-geschoss HE shells 92g, with 20.4g of HE
plus various AP rounds

30mm MK108 fired:
mine-geschoss HE shells 330g, with 82.5g of HE
plus AP rounds (of very limited effectiveness due to low velocity)

The Soviet 23mm VYa (predecessor to the ZSU) was using:
HE shells 200g, with 14g of HE
AP shells 200g, with 6g of HE but better penetration than any of the above weapons.

While the Mk108 could do that much damage with one hit, it is likely that each hit from a VYa round would damage an area much less than a quarter of that (roughly cubic relationship with charge weight, for radius (half for the lighter charge) ~ squared for area)