Oh yeah, I've heard of that shoot. Pretty insane. Like you say, the ammo bill must be immense, but it's a bit of fun.
I'd possibly shoot the drone.
I did a three gun event last year and at the end they have a log chop just because. People form teams of three: One rifle, one shotgun and one handgun, and they have to cut down a 4x4 log set up down range. There were 15 teams so 45 shooters and on the go everyone opens up on their designated log. It was pretty cool. Not as cool as this video, but cool nonetheless.
I saw a video of an M134 Minigun fucking up a car once...It's pretty brutal what that many 7.62 rounds do to a solid object when