Back story: With the .380 you usually have to chose between penetration with no expansion or expansion with substandard penetration. But due to shear fate, luck, accident two old tech JHP designs in the form of XTP and Hydra-shock actually result in some expansion while still penetrating 12." Unfortunately Hornady suspended production of .380 XTP ammo post Sandy Hook to concentrate on making more of their best sellers.
The good news is Hornady is once again manufacturing .380 XTP ammo. Midway got a shipment last week which sold out immediately. They expect their next shipment in October. Cabelas currently has both Hornady XTP and Federal Hydrashock .380 in stock.
If you carry a LCP or Glock 42 you should be carrying ball, XTP or Hydrashock. All three are currently available once again.