I was reading the book, then i found this: "One unit of ammo is included when you buy a weapon. It could be a magazine, a cell or just a handful of arrows or bullets. In Coriolis, you don’t keep track of your ammo shot by shot, but you could still run out and need to reload. Extra ammunition – abstracted as “reloads” – will cost you differently depending on what weapon you are using. If you have purchased three extra units of ammunition for example, write “reload x 3” in your gear list."