Definitely worth having two shots available....the first shot is usually me going "Holy crap, theres a whizing brown thing over that way, I'll try and shoot in front of it" The second is me going..."oh, now I'll take a real poke".
OR, there's three birds in the tree, and my hunting partner J-MAN points up at them, and we shoot a couple as they flush from the tree...(of course I would never, ever shoot a Grouse that was not on the wing!).......now my hunting partner...he likes the taste of Grouse and I however cannot control his actions :-)
