There are several different words used to describe ammunition: bullets, shells, projectiles, rounds, shot, slugs, cartridges, munitions, etc. In reality anything can be used as ammunition, whether it be a stone you are throwing or words you are using in an argument. In the world of firearms it is most commonly referred to in the informal context as "ammo." Many people call them bullets, which to some is like nails on a chalkboard because the correct term for firearms ammunition is "cartridge."
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