Shotgun bullet

using UnityEngine;

public class ShotgunBullet : Bullet
{
    private Vector3 _direction;

    private void Start()
    {
        var rotatedVector = Vector3.left;
        var bulletRotation = transform.rotation.eulerAngles * Mathf.Deg2Rad;

        var x1 = rotatedVector.x * Mathf.Cos(bulletRotation.z) - rotatedVector.y * Mathf.Sin(bulletRotation.z);
        var y1 = rotatedVector.x * Mathf.Sin(bulletRotation.z) + rotatedVector.y * Mathf.Cos(bulletRotation.z);

        _direction = new Vector3(x1, y1, 0).normalized * (Speed * Time.deltaTime);
    }

    private void Update()
    {
        transform.Translate(_direction * (Speed * Time.deltaTime), Space.World);

        TrySelfDestruction(Time.deltaTime);
    }
}