There is already something similar out. Paintballs loaded with dry O/C powder or liquid O/C-C/S mix. I have seen them used up close and personal to great effect. They actually go out at twice the FPS than normal paintballs so they sting like a B*tch too. They also have a UV dye marker in them so there is no doubt who was or was not involved in an incident.
CC
Normal paintball velocity is around 300 fps. If these are being shot at twice that, not only is it really hard on the paintball marker (gun), it can also permanently blind someone if they’re hit in the eye. If the object is to force the person to leave the area, there’s no point in maiming them.