Can't add the power of explosion to the bullets

Questions & Answers
1

I have a gun in my FPS. It shoot correct and now I want to add an explosion power to the bullets. But when I use this code, the bullets fly to the sky, when I shoot, not to that direction, to where I’m looking.

public GameObject explosion;
	public GameObject armor;

	float explosionRadius = 5.0f;
	float explosionPower = 2000.0f;

	void Start()
	{
		Collider[] colliders = Physics.OverlapSphere (
			transform.position, explosionRadius);

		foreach (var hit in colliders)
			if (hit.rigidbody && 
			    hit.rigidbody.tag != "Player" &&
			    hit.rigidbody.tag != "Gun")
				hit.rigidbody.AddExplosionForce (
					explosionPower,
					transform.position,
					explosionRadius);
	}
}
2

Do you mean shoot the bullets with explosion force or when the bullets hit with something then add explosion force to the hit?