If you haven't seen this guy's YouTube channel yet, you should definitely check it out. Ted's HoldOver features some of the most extreme pigeon shooting footage on the web.
A few points: 1) Ted either eats the pigeons or feeds them to his cats; 2) Most of his shoots are done for extermination purposes at a farmer's request; 3) Almost all of his footage features clean kills.
In this video Ted is shooting pigeons with an air rifle at 100 yards in a 25 mph wind. The slow-motion footage shows the wind-drift and drop of the pellet.