Ammo- fodder for a firearm
Round- fodder for firearm
Shell- ammo for a cannon, Naval gun or shotgun
Hull- empty shotgun shell
Cartridge- loaded ammo for a rifle or pistol (case, primer, powder, bullet or in case of a blank, plug) or ink for printer.
Bullet- Projectile ejected from a firearm
Case- the object that contains the primer, powder and projectile
Magazine-place where ammo is stored
Clip- devise used to feed ammo into the firearm
Collection- The firearms I'll show you
Arsenal- The firearms I won't show you or the legal weapons you see displayed on the TV news.