I started using the GU Box Launcher last year when a guy from our club was getting ready fo the Master National. It works great for walk ups. Its easy to hide and gives a large enough throw for the closer range. For work under 50 yards they are fine but if your thinking longer then go with a winger.
As for the distance- We used mallards but really Dokkens work better. I would guess they throw a mallard about 15' high.
Thanks for the reply. My interest in this launcher was to get ready for an Upland Test. I want to throw live pigeons or Chukars to prepare my dogs for Sit-to-the-flush. Simulate hunting with the box in some lite cover then remotely release the bird when the dog gets close. Will the box hold that small of a bird? Or will it escape? Do I need a Duck or Pheasant?
I have a couple and they work okay inside 50 yards as previously stated. I don't like using them for marks because I fear that a hard running dog (mine) will run into it because it does not stand out like a winger or blind once the dog gets close.