Alright so when i was mining i came up with this idea.

In era ammo ar just normal ammos, but if u can ADD something to the ammo wouldnt it be better? Like diamond coating would add an additional of 3dmg so per an example bar, bar shooting ONE diamond coated bullet would do 13 dmg at perfect condition. To accquire the diamond coating u need diamonds and ammo, but to make it a limited ammo, u would need 1 Diamond and 1k ammo to get 1k diamond ammo.
Different types of bullet
-Quartz Bullet +0.5 Dmg
-Copper Bullet +1.5 Dmg
-Iron Bullet +2 Dmg
-Gold Bullet +2.5 Dmg
-Diamond Bullet +3 Dmg
Hope u like this idea of mine, its JUST an idea.