I have partially blocked forward venting revolvers already, but a 9mm short round needs to be around 20cm from the balloon to burst it

I swapped to .38 long rounds, which have a longer range, but are very loud and has already put one of my horses off jumps with balloons

Hence why I have gone FAC route, to use a cap and ball pistol with a clear barrel in the hope that I can achieve effective balloon range, without it being too loud for the horses.

Hope that makes sense