I am trying to simulate a gun in which shoots multiple bullets at the same time(similar to a spread out shot). I am thinking I have to create another bullet array then do the same as I have below but in a different direction.

Here is what I have so far:

foreach (GameObject bullet in bullets) 
    {

            // Find a bullet that isn't alive
            if (!bullet.alive)
            {
                //And set it to alive
                bullet.alive = true;



                if (flip == SpriteEffects.FlipHorizontally) //Facing right
                {
                    float armCos = (float)Math.Cos(arm.rotation - MathHelper.PiOver2);
                    float armSin = (float)Math.Sin(arm.rotation - MathHelper.PiOver2);

                    // Set the initial position of our bullets at the end of our gun arm
                    // 42 is obtained by taking the width of the Arm_Gun texture / 2
                    // and subtracting the width of the Bullet texture / 2. ((96/2)=(12/2))
                    bullet.position = new Vector2(
                        arm.position.X + 42 * armCos,
                        arm.position.Y + 42 * armSin);



                    // And give it a velocity of the direction we're aiming.
                    // Increae/decrease speed by changeing 15.0f


                    bullet.Velocity = new Vector2(
                        (float)Math.Cos(arm.rotation - MathHelper.PiOver4 + MathHelper.Pi + MathHelper.PiOver2),
                        (float)Math.Sin(arm.rotation - MathHelper.PiOver4 + MathHelper.Pi + MathHelper.PiOver2)) * 15.0f;



                }


                else //Facing left
                {
                    float armCos = (float)Math.Cos(arm.rotation + MathHelper.PiOver2);
                    float armSin = (float)Math.Sin(arm.rotation + MathHelper.PiOver2);

                    //Set the initial position of our bullet at the end of our gun arm
                    //42 is obtained be taking the width of the Arm_Gun texture / 2
                    //and subtracting the width of the Bullet texture / 2. ((96/2)-(12/2))
                    bullet.position = new Vector2(
                        arm.position.X - 42 * armCos,
                        arm.position.Y - 42 * armSin);

                    //And give it a velocity of the direction we're aiming.
                    //Increase/decrease speed by changing 15.0f
                    bullet.Velocity = new Vector2(
                       -armCos,
                       -armSin) * 15.0f;
                }

                return;
            }// End if

    }// End foreach