Because of the time required to load this weapon, you can fire only a number of shots equal to the number in the parentheses after from it before you need to load it, regardless of the number of attacks you can normally make. You may reload the weapon as the start of your attack action or as a bonus action(you need a free hand to load a one-handed weapon). For example, if you have two extra attacks(a total of three attacks) and a weapon with "Loading(2)" you may only take two attacks as part of your attack action, even if you have one last extra attack.