I have called in bears with a predator call. The best was 5 bears in 2 1/2 days. Some come in fast and some just walk in. After the snows hit they seem to ignore the call. Perhaps it was just the time but they probably are not interested in meat when they are ready to hibernate. I generally use an open reed call such as Crit r call and make deeper deer-like sounds. That worked for me, however they probably come to most any distress sound. In CA the electronic call is not legal for big game.
The key is to fish where the fish are. Do your research and talk with biologists, houndsmen and most of all, trappers to get the location and food they are on.
Good hunting!