Just intreasted, duds
 

From other posts realise how much detail you try & fit in & was just wondering if in cases where it was a known problem like WW2 some allied tanks. Are duds "soft ammo" modeled if it was common. Or possibly factored in to penetration rating.
Realise a random amount is added to with greater variety if its HEAT ammo.
Also I am guessing the reason say Russian tanks in service with other countries generally have a worse penetration figure is due to sub standard ammo.