My Sig P238 likes Remington Golden Sabers the best but shots Federal Hydra-Shok's just fine.

Not too familiar with the PK380 but I know that the PPK/s is very touchy with HP ammo. The nose of the bullet has to be as round as possible or it won't feed correctly. My friends is fairly new so we are still trying to find something reliable in hers. If the PK380 has a similar design it might have the same issue (the P238 barrel tilts up when the slide is back so the feed angle seems better).