Sorry I can't open your file since it's saved in a more current version of C2 than mine.
I'm in a slow-internet location atm that's why I can't update.
I'll just try to solve your problem without the capx.
Moving a Sprite/Tile with the bullet behaviour isn't that much of a problem.. (if I understand correctly what you are trying to achieve).
If you simply want the Sprite to move at a constant speed, you can go with the action "Sprite: Bullet - set speed to [whatever speed you want].
If you want to accelerate it, set the initial speed to whatever you like and then set the acceleration to a positive value.
The higher the acceleration, the faster the speed increases.
Give the Sprite the behaviour "Wrap" and that's it.