I've never shot a bear or lion w/ a .357, but wouldn't hesitate with the right load.
I shoot Buffalo Bore 180 gr hardcast lead flatnose out of my S&W Mod 27 6" barrel which gives me 1500 fps (actual chrono'd speed, not published) and 900 ft-lbs of energy. I've shot this load thru a 9" diameter live pine tree. Also, check out ammo from Doubletap and HSM, which provide some similar loadings.
Don't have any advice on the type of calls.
Good luck!