To date I have found a series three land rover a very very success full projectile. The square front and lack of aero dynamics really helps take them out of the air. The roof rack does a perticually good job too (not so good with high value furniture like items up there mind you). I have no idea of the ftlbs of a 1 1/2 tons of land rover doing 60mph, but its always a quick, even if not very clean kill :-) Normally get about one a month. Mind you I have lost 2 wing mirrors to the buggers!

Honestly with rearguard to the notion its not sporting to maim them in flight with a shotgun so your dogs can then have a chew, well i really don't have much of a answer to that one :-(