::snicker:: I reckon that's one idiot "Puff" who may learn better manners for the future (though, given what we've seen of the wizarding world, I doubt it). I do hope Harry reclaimed the rest of those rounds, these ignorant wizards would create all sorts of mayhem since they don't understand them; on the other hand, they may just have a bit more respect for non-magical weaponry now.
This is quite the fun story and I'm waiting to see how the wizarding world reacts to such non-magical means of competing. Speaking of muggle weaponry, a dragon is the only "game" I can think of where a Barrett might be too little gun for the target.