I was in Phoenix varmit callers and a lot of guys called in bears using circe trophy call in jackrabbit. It takes a lot of wind as you have to call for 45 to 60 min. with out stoping. I tried with no luck. just make sure someone is watching your back. once when calling bears something came behind me and i would not look back thinking it must be a deer or elk, come to find out my partners were all looking straight ahead. Not Good.
Well not saying that it cant be done but in the spring a bears digestion is not ready for meat. When they come out of hibernation they tend to eat grasses and shrubery. This seems to be eaiser on the stomach until they adjust and then they eat anything they get there hands on.