Standard hand grenade is roughly 400g / 1 pound; 40mm grenade launcher ammo often is half a pound / 230 grams. That's considered reasonably effective by the mi

Standard hand grenade is roughly 400g / 1 pound; 40mm grenade launcher ammo often is half a pound / 230 grams. That's considered reasonably effective by the militaries, and fully within the capabilities of many cheap quadcopters.