You most likely have a J frame revolver in 32 S&W Long. Not a lot of choices on defense ammo there.
You can look at Buffalo Bore, I think they have something a little warmer than standard loading. 32 S&W LONG (32 COLT NEW POLICE)
S&W have sold a lot of guns that were nickel-plated, which is what you likely have unless someone has had one after-market chromed or the revolver is stainless steel.