Shotgun Spread Issue

Hello, Im trying to make a shotgun script but im failing at making the bullets spread. The bullets instantiate fine but they go on the same direction, anyone has any idea how to fix this ?

Here is my code :

 function Update()
 {
 var hit : RaycastHit;
     var forward = transform.TransformDirection(Vector3.forward);
     
     forward.x += Random.Range(-spreadRate, spreadRate);
     forward.y += Random.Range(-spreadRate, spreadRate);
     forward.z += Random.Range(-spreadRate, spreadRate);
     
     if(Physics.Raycast(transform.position, forward, hit))
     {
         if(Input.GetButton("Fire1") && canShoot==true && playerSettings.shotgunBullets > 0 && shotgun.gameObject.active == true)
         {
                var bulletInstance : Transform;
                var bulletInstance2 : Transform;
             bulletInstance = Instantiate(bullet, barrelEnd.position, transform.rotation);
             bulletInstance2 = Instantiate(bullet, barrelEnd.position, transform.rotation);
             bulletInstance.LookAt(hit.point);
             bulletInstance2.LookAt(hit.point);
             playerSettings.shotgunBullets -= 1;
             w();
             //shotgun.animation.Play("Shoot");
             audio.PlayOneShot(soundEffect);
         }
 }

The bullet HAS to be a prefab!

Thank you for your time!

Edit : The bullet script :

 #pragma strict
 
 var bulletSpeed : float = 10;
 
 function Awake()
 {
     Destroy (this.gameObject, 5);
 }
 
 function Update()
 {
     transform.Translate(Vector3.forward * Time.deltaTime * bulletSpeed);
 }
 
 function OnCollisionEnter()
 {
     Destroy (this.gameObject);
 }