#6 shot would take down a drone as any imbalance in propellers will cause havoc with the drone. Choke is critical for any distance, so extra full to turkey choke will impress. We use #5 Copper plated on long range crow shots, 1 1/2 oz to 1 5/8 oz at 1300-1350 fps, and you better be using a gas operated auto to shoot this kind of load.
TSS is in another league regarding distance and pattern density, but the cost is too high for crow hunting. Drone hunting is pretty much a joke because the person would be arrested for shooting in an incorporated town/city.
Police cars may have TSS with flite control wads in the future.
en.wikipedia.org
