You don't have to. An explosive round that detonates nearby will take a drone down, too. If I remember the details correctly, the Metal Storm[1] weapon system

You don't have to. An explosive round that detonates nearby will take a drone down, too. If I remember the details correctly, the Metal Storm[1] weapon system should be able to do just that: Fire explosive rounds set to detonate at a specific point in their flight. Fire n^3 rounds to cover enough space to account for speed, direction and altitude changes and you should be set. [1] https://en.m.wikipedia.org/wiki/Metal_Storm https://en.m.wikipedia.org/wiki/Metal_Storm