If it's just one bullet, I wouldn't be concerned with performance issues simply calculating collision.
As already suggested, anything the bullet can "bounce" off of, just add it to a family and make a single event (if bullet collides with family -> do stuff).
That would easily be the, easiest solution.
If you had zillions of bullets, then using angle comparison might be better, but for a single bullet (or even 100 bullets) I wouldn't bother with a complex solution like that.
~Sol