Fire 2 projectiles?

[Will the Terrarian]

Hello, I am looking to create a Shroomite Repeater that fires 2 arrows at once. All the code works, except I don't know how to implement such a feature. I am looking for code like the Chlorophyte shotbow's... Any suggestions?
Code:
item.damage = 100;
item.ranged = true;
item.width = 54;
item.height = 24;
item.maxStack = 1;
item.useTime = 13;
item.useAnimation = 19;
item.useStyle = 5;
item.knockBack = 4;
item.value = 300000;
item.rare = 8;
item.UseSound = SoundID.Item5;
item.noMelee = true;
item.shoot = 1;
item.useAmmo = AmmoID.Arrow;
item.shootSpeed = 18f;
item.autoReuse = true;