AP/HE ammo ???

[Cross]

Here's what it says in the Game Guide:

NOTE: The 'sabot' round in WW2 was normally Armour Piercing Composite Rigid (APCR) (Also known as HVAP, High Velocity Armour Piercing), but can also represent true sabot rounds like APDS (Armour Piercing Discarding Sabot) where the sabot (=shoe) surrounding the sub calibre penetrator is dropped after exit from the muzzle, which improves drag coefficient no end, only Britain used true sabot (APDS) ammo in WW2.

The AP round can represent APDS ammo in some units, with the sabot round being used to represent some form of uprated shot in lesser supply, perhaps.