Since fuel can bombed and reduced to 75% available. why not make it a simular way for ammo/bombs.
100% up all ammo/bombs available
75% up Bombs 500kg/1000bls or less available, 75% cannon ammo load
50% up " " 250kg/500lbs or less available, 50% cannon ammo load
25% up " " 100kg/250lbs or less available, 25% cannon ammo load
as it is now ammo had ZERO effect on fighters which it could in RL
have a affect on ammo quality and quantity, especially the high end
cannons.
This would also leave field defenders with atleast 250 lb bombs to defend with.