the same logic you use for duck hunting applies to drone hunting. you want to use a shotgun with birdshot, it's going to spray a lot of small bits of lead in a big cone. even if the drone is moving quick, it shouldn't be hard to disable a cheap drone.  the shield has been a tried and true part of warfare for many thousands of years. in current year, you see riot police using ballistic shields effectively, but for stopping a drones explosive from penetrating, the shield would probably have to be quite thick, like multiple ballistic plates worth of thickness.
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