500N:
Within 60 - 70 yards, 32 - 36gms of No 4's
Maybe we need a "net round" and maybe a few busted drones hanging on the front fence might warn others off.
On a more serious note, I am concerned that the larger drones could be a serious hazard if ingested into a jet engine, perhaps on takeoff. My opinion is that the land areas at the end of runways out to about the 500ft altitude are going to have to be made "no go areas" to try to keep the stupid pricks away because some little ***** is going to think it would be "cool" to get a video of a jet taking off...from above.