Okay. So it is only the bombs that give you a 0000 display for ammo? Sorry. I obviously misunderstood the question. There is no ability to drop bombs in Weapon for FSX. The mods that include "so-called bombs" are really missiles that perform like bombs and not really bombs.

From the ‘Weapon for FSX’ - User’s Manual (CSWeapon_manual.pdf) page 8:
2. Weapon Type Selector Switch Ctrl+7
GUN - gun Ctrl+Shift+7 to cycle weapon sub-types:
M60C Ctrl+Shift+8 to select fire mode for any weapon subtype
GSH-30
M61 Vulcan
RCKT - rockets Ctrl+Shift+7 to cycle weapon sub-types:
Hydra 70
Zuni 127
MSL - missiles Ctrl+Shift+7 to cycle weapon sub-types:
AIM7 Sparrow
AIM9 Sidewinder
BOMB - bombs (inop)

inop = Inoperative (not working)

Mark