Projectile collision have strange behaviour

I follow the tutorial BP Twin Stick Shooter, all have done well just have a little bit problem with the projectile wont collide with walls and floor even with collision set to blockAll.
So i try to make it like FPS template projectile by change apply the collision sphere to the “Default scene root” this make the sphere become Root component.

  1. When the sphere become root it apply
    scale to my projectile mesh that
    make very difficult to setup
    collisio sphere to and the mesh
    matching the size.
  2. The projectile collision with walls and the others static mesh well, now
    it wont collision with Destructible
    mesh anymore, it could generate hit
    event which destroy itself and spawn
    a emitter at hit location but the
    destructible mesh wont fall.

How could i make projectile collide with both static and destructible mesh?