HESH ammunition possesses Overpass, which means it always acts as if its PEN was equal to the target's ARM (wound on 4+).
However, this effect is only possible against solid plate such as Steel Armour or Aluminium Armour.
When targeting Composite Armour, this shell acts as a regular HE Shell of its calibre, but with No Fragmentation.
When employing generic HESH ammunition:
- Apply full EXP-DMG and add +1 dice rolls (3*10d20 -> 4*10d20).
- If the target is 4 ARM or greater, subtract -1 dice roll instead (3*10d20 -> 2*10d20).
- Do not calculate fragmentation (Exp. Rules NF).
As HESH Shells are Explosive, their PEN is not affected by distance.