Vector3 Reflect, Setting new rotation

Hi there.
I'm trying to make my bullets richochet after hitting walls. I am using Vector3 Reflect. And it works as long as I work with raycasts. However I have no idea how to set new object's rotation in order for it to move in new direction

Code (CSharp):

1.     private void OnCollisionEnter(Collision collision)
2.     {
3.         ContactPoint contacts = collision.contacts[0];
4.         Vector3 reflectDir2 = Vector3.Reflect(transform.forward, contacts.normal);
5.  
6.         //transform.rotation.SetFromToRotation(transform.forward, Mathf.Deg2Rad * reflectDir2);
7.         //transform.rotation = Quaternion.FromToRotation(Quaternion.ToEulerAngles(transform.rotation), reflectDir2);
8.     }

I've tried many possibilities, I've read dozens of topics but I couldn't make anything work. What may be the cause, How should I approach this?

This is how it looks at the moment
https://i.gyazo.com/df77d58683e61e73c771d217b8d06f15.mp4

.

 

Code (csharp):

1. transform.rotation = Quaternion.LookRotation(reflectDir2);

Should do the trick I think. It sets the rotation to point in the direction of the vector.

 

this works