bullet hole on shot

I have this script that shoots a bullet from my muzzlePoint to my cursor. If i want to add a bullet hole the bullet hole will be on the wall before the bullet hits. So i wanted to use the function OnTriggerEnter. How can i get this to work when it shoots?

 #pragma strict
 var bullet : Transform; // the bullet prefab
 private var spawnPt : GameObject; // holds the spawn point object
 var bulletHole : Transform;
  
 function Start()
 {
  
 }
  
 function Update()
 {
      if(Input.GetMouseButtonDown(0))
      { 
  
        // only do anything when the button is pressed:
 
         var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
         var hit : RaycastHit;
 
         if (Physics.Raycast (ray, hit, 100))
         {
             if (!spawnPt) spawnPt = GameObject.Find("muzzlePoint");
             var projectile = Instantiate(bullet, transform.position,   Quaternion.identity);         
             
             projectile.transform.rotation = Quaternion.LookRotation(ray.direction);
             projectile.rigidbody.AddForce(ray.direction * 1000);
         }
 
         OnTriggerEnter();
 
         audio.Play();
      }
 }
 
         function OnTriggerEnter (other : Collider) {
             var hit : RaycastHit;
             if (other.gameObject.tag == "wall") {
                 var hitRotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
                 Instantiate(bulletHole, hit.point, hitRotation);
             }
         }