I use Federal 9mm HST in my MK9 and EMP. I was curious about the Federal .380 HST since I use a CZ 83 as a backup pistol in .380.
Here is the Federal .380 HST Test.
https://www.youtube.com/watch?v=lhByLwyvGpA
The results were largely unacceptable to me.
For now the Buffalo Bore .380 Hardcast +P remains my Go To ammo for now.
https://video.search.yahoo.com/video...spart=iry&tt=b
I do realize the limitations with this ammo also. I am still looking for a good .380 Standard Pressure Defense round. Federal .380 HST is not it despite the ad in American Rifleman.