I've read somewhere that several homes, cars, and even people are hit by what officials think are stray bullets fired into the air. The stats I read were for New Years Eve and I think 4th of July, and they were for part of the mainland (or maybe just for LA- I don't remember for sure). It was a much higher number than I would have guessed.
When I get on a "real computer", I'll try do a little trajectory estimate using GIS. I'll estimate the linear distance from range to Sandys parking lot, and I'll also estimate the trajectory distance which will take into account the elevation of anything in this path. I'll try to produce a series of trajectories which may account for vertical angle of gun.
While it's more likely a bullet than a meteorite, I'm guessing it's pretty unlikely that it originated from the range. When I get my little GIS project done, I'll be able to make a more educated guess.