I don't know of any 200gr factory load for .357, but if there isn't one, there ought to be. I haven't killed any large animal with the .357, and I can't attest to the performance of any expanding 180g load. But I can tell you that the hard cast 180gr from Buffalo Bore from a 4" Security Six clocks a little south of the advertised 1400fps, and is pretty unpleasant to shoot.
The shooter who can make fast and accurate follow up shots with that load in a 4" medium frame revolver has my deepest respect. In a large frame, it might be more practical, but I don't have one around here to try.
