Wolves are highly intelligent animals. Sometimes you can get one off a gutpile, (young and stupid ones). Calling does not seem to work here in the interior of Alaska. Last month I tried calling in an area that no one had tried calling in. The only call they responded to was a Cayote Howl. They would come running, but would not come out into the clear, they would stop back in the brush and check things out, then fade away. Up here the Ravens will give them away when they make a kill. So we just go out and look for Ravens circling an area, then try and sneak up on the location with a long range gun, ie: 30-06 Handi.
My hunting partner claims wolves "never eat cold meat!" Down in the Alaska Range where they are heavily hunted I have to agree. Once they make a kill they eat as much as they can hold then leave. They never return to that site. They will make another kill tomorrow or the next day. Wolves do not have any trouble pulling down a full grown Moose, Caribou, or Sheep. I've seen Wolves kill seven or eight Caribou in a killing spree then never feed off the carcuse. It lies there till the scavengers clean it up. Now down in Mt. McKinnley Park they will return to a kill site, but they are not hunted there. My self if no Ravens are present, I will stop and glass a valley before crossing over into it with a snow machine. Sometimes I locate wolves moving in the area. I then figure out a way to get within range.