That was a pretty awesome video, I would love to do this!
When I saw the title of this thread I figured the ethics police would show up on the first page... Soooo closeFun - yes, Effective as a means of culling - sure, but humane ? not really. The guy was a phenomenal shot - given that he was in a moving aircraft - but alot of those were less than stellar placements, and .223 is on the low end of the spectrum for calibres you'd use on beasts of that size.
The last pig clearly illustrates this as it continues to run with half its guts hanging out. Alot of those animals likely had a less than quick death.
Our record in the last 2 and a half years of shooting this area is 223 hogs in 2 hours.