The "rubber bullets" currently used on people that you're thinking of are called baton rounds, they're like a solid plastic slug similar-ish in size to say the cardboard you're left with when your loo roll runs out.
You can comfortably hit a man sized target with the things if the man sized target is standing at the end of the typical driveway and you're say at the front door, when the distance gets much further than that it is a bit more hit and miss...
As far as firing them up into the air at a drone moving about, it isn't going to be too practical, they're not really all that accurate and don't have much range.