I fired these out of a 6" Colt into water jugs and got slight expansion . I bet if you loaded your own using Winchester 60 gr STHP bullets you might get better expansion .Magtech loads a .32 S&W sjhp rated 778fps. At that speed it's very unlikely to expand, but should be the same as a semi wadcutter.
I think with the .32 SWL you are looking for penetration rather than bullet expansion given the relatively low velocity . JMO