While one could argue the efficacy of taking out drones with a shotgun, the reality is that if you shoot at ANY drone with a firearm you will have every police force that has jurisdiction chomping at the bit to charge you with a felony. Drones (for now) should be handled with collective passive action. The easiest method that is legal in most places is to tether balloons/kites up to the maximum allowed FCC air space (typically 400feet above ground). A neighborhood of homes all with their own tethered balloons basically creates a no fly zone for drones. And most importantly it's not a felony.