The idea of different weapons – to be different :)
Well muskets could pierce through a guy and hit another one behind him and can shoot straight, means that he can´t overshoot to target behind the first one whos blocking line of sight.
One round reload and one round for shooting.
I even had idea of strings, where it would be much worse weapon, but you could shoot for 2 or 3 rounds with a chance to stun target, while you will consume no ammo, since its ammo is stone.
