three gun,
The problem with trying to hit helium baloons is that they all go upwards. Unless you hit them right when they are released, you will be sending hot lead skywards. Who knows where these rounds are going to land and who could they potentially kill? If you ask me, I would say that is a clear violation of knowing your target and what lies beyond. Besides, if you miss your target, you are endangering wildlife such as sea turtles that may have the balloons lodge intheir throats (I've been told they look like jelly fish when they float on top of the water). One solution is to tie a helium filled balloon to a remote control car and have someone drive it down range. Just be sure not to hit the car or else your kid will be really pissed off at you!