I found a bug where if you create 9999 ammo/bullets youll have an unlimited amount. Though thiers another bug that happens when u get 9999 which wont let you use the ammo. but if you craft another ammo Equip it with an gun such as a pistal. shoot a few shots then put what REMAINED of those shots in the backpack then shoot. if so you should have unlimited ammo. Unless its the numbers thats bugged.