Lower the amount of ammo you find via loot drops and signs to show new loot types

[Adam the Waster]

Simple. Lower the amount of ammo you get via any type of loot drop. Instead give bullet components so people can pick what's ammo to make. Maybe rarely you get bullets

And as @Laz Man said there now different drops for type of zombie.

But there should be a way to tell. Medical, food, bullet, junk symbols would be helpful