you could shoot FMJ and get 12" everytime, put it in the vitals and it will still hurt... XTP does penetrate better than the HST in 380...so does the hydrashok....HST in 9mm is the cats ass though...
this is the best 380 video for micro pistol ammo:
https://youtu.be/GNtPHYwcDtsprecision one with XTP ammo penetrated 13"+ in denim and bare...
reviews goldots around 6:00 mark
http://shootingthebull.net/blog/final-results-of-the-380-acp-ammo-quest/