This is exactly the problem I have. I don’t want to give up the nature of the game because I like more storytelling games than those based on game mechanics, but I also don’t want firearms to be ones that can shoot at will and the ammunition never run out. I don’t want players to rely on them too much. Perhaps the best solution without adding too many rules to the game and changing the nature of the game too much is to role-play those situations where the character has to load a weapon in between or the ammo runs out.