Being a archer/thrower and have eough of the right ammo can be hard.
and even if you do have all the right stuff and have eough of it, then you have used like a page or 1½ of your invitory to have it all.
so my idea is, just like with the food, make a container, a Ammo pack or Ammo crate, that can hold the different kind of ammo in the amout that you have made them in, arrows, bolts, throwings axes, heck even Javelins. all of theses just takes up so mutch space.
example:
Masterly demask arrows (cold,fire,bless) x1000
Demask arrows (cold,fire,bless) x1500
Javelins +3 x100
Javelins +4 x45
and so on.