Finding factory LSWC .357 Magnum ammo is going to be more difficult if not almost impossible. MagTech does make them but finding them is a totally different story.
Grizzly Cartridges makes a 180gr Lead Wide Flat Nose .357 Magnum round that is very hot but it's not really what you asked about.
I just did a quick search of my regular ammo on-line shops, all I see is average 357 stuff - 1300 fps 158gr HP and JHP, and only a couple of LSWC listed. Everyone wants hollow points, everyone sells hollow points.
The hottest factory loads I know of (and there may be others) come from Double-Tap - typically 1600-1700 fps from 4" bbl.
Example here (not LSWC though): DoubleTap Ammunition
Buffalo Bore also has some 1500 fps rounds. This might be the 'warm' stuff for which you are looking. Still it is not LSWC.
I have a box someone gave me of 125gr Double Tap I won't even shoot in my K frame 13-1.