Weapons loadout question

Doing the campaign i've been playing with the weapons loadout and changing the ammo type. Right now I run Armour piercing , .303's & incendiary mixed. I'm not sure if they are all included though because I could add what seems like infinite amounts into the wings without any message saying the load out is full.

With the Hurricane the default are the .303's , how many ammo variations can you have in the wings? One for each gun ? So 8 in total?