How do I get Single ammo reloading to work?

I'm trying to make my gun script reload similar to that of current FPS in which if a player shoots 1 bullet and the player reloads the gun then it will reload the gun to the full clip amount and take into account of the 1 ammo left so that on the final clip of ammo there'd be 1 ammo less than on a normal clip.

For example you have 35 ammo with 7 per clip. You shoot say 2 times and then reload meaning your total ammo is 33. You will have a full clip until your last clip where there will be 5 ammo in the clip instead of the full 7 due to the already spent ammo.

I've managed to make it so my gun reloads after all 7 ammo per clip has been used up and then reloads with another 7 ammo however I have been unable to figure out how to implement the above problem. Anyone able to help me out to figuring out what I need to do, to do this?

I've implemented below the use of the R button on the keyboard for when you will reload for single shot ammo however when I currently reload it just slows the audio for reloading so it sounds all distorted. And also when bulletsLeft is = to less than 0 in the clip then it will automatically reload a fresh new clip of 7 ammo.

RayShoot Script

  public int clip = 80;
  public int bulletsPerClip = 60;
  public int bulletsLeft = 0;
  public int particleSpeed = 200000;
 
  public float damage = 10.0f;
  public float range = 1000.0f;
  public float reloadTime = 1.6f;
  public float force = 1000;
  public float fireSpeed = 15.0f;
 
  [HideInInspector]
  public float waitTillFire = 0;
  public GameObject bullet;
  public GameObject bulletSpawn;
 
  public float shootTimer = 0.0f;
  public float shootCooler = 0.1f;
 
  public float keyCooler = 0.5f;
  public float keyTimer = 0.0f;
  
  // Use this for initialization
  void Start () 
  {
  bulletsLeft = bulletsPerClip;
  //  hitParticles.emit = false;
 
  }
 
  // Update is called once per frame
  void Update () 
  {
  if (keyTimer > 0)
  {
      keyTimer -= Time.deltaTime;
  }
 
  if (keyTimer < 0)
  {
      keyTimer = 0;
  }
 
      
  if (shootTimer > 0)
  {
      shootTimer -= Time.deltaTime;
  }
 
  if (shootTimer < 0)
  {
      shootTimer = 0;
  }
 
  if (keyTimer == 0)
  {
      if (Input.GetMouseButton (0) && bulletsLeft > 0)
      {
          if (shootTimer == 0)
          {
              PlayShootAudio();
              RayFire();
              Instantiate(bullet, bulletSpawn.transform.position, bulletSpawn.transform.rotation);
              shootTimer = shootCooler;
              keyTimer = keyCooler;
          }
      }
      else if (Input.GetMouseButtonDown (0) && clip == 0)
      {
          PlayEmptyAudio();
          shootTimer = shootCooler;
          keyTimer = keyCooler;
      }
      if (Input.GetKey(KeyCode.R))
      {
          Reload();
          shootTimer = shootCooler;
          keyTimer = keyCooler;
      }
  }
  }
 
 
  void RayFire()
  {
  GameObject.Find("CQAssaultRifle").animation.Play("GunFiring"); // First name is for name of object that will play your animation and second name is what you animation is called
 
  RaycastHit hit;
  Vector3 directionRay = transform.TransformDirection(Vector3.forward);
  Debug.DrawRay(transform.position, directionRay * range, Color.yellow);
  
  if (Physics.Raycast(transform.position, directionRay, out hit, range))
  {
      if (hit.rigidbody)
      {
          // if (hitParticles)
          // {
          //      hitParticles.transform.position = hit.point;
          //      hitParticles.transform.localRotation = Quaternion.FromToRotation(Vector3.forward, hit.normal);
          //      hitParticles.Emit();
 
          hit.rigidbody.AddForceAtPosition(directionRay * force, hit.point);
 
          //      hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
          // }
      } 
  }
  
  bulletsLeft--;
 
  if (bulletsLeft < 0)
  {
      bulletsLeft = 0;
  }        
  if (bulletsLeft == 0)
  {
      Reload();
  }            
  }
 
  void Reload()
  {
  if (clip > 0)
  {
      StartCoroutine(ReloadSpeed());
      clip--;
  }        
  }
 
  IEnumerator ReloadSpeed()
  {
  if (clip > 0)
  {
      // GameObject.Find("").animation.Play(""); // First name is for name of object that will play your animation and second name is what you animation is called
      PlayReloadAudio();
      yield return new WaitForSeconds(reloadTime);
 
      //if (clip > 0)
      //{
      bulletsLeft = bulletsPerClip;
      //}
  }
  else if (clip < 0)
  {
      PlayEmptyAudio();
  }
  }