Here are my complete thoughts on 380 ammo selection.
Essentially, flatnose FMJ is a conservative choice that penetrates better than any JHP. The problem with 380 JHP is that the bigger they expand, the less they penetrate.
So I chose the XTP bullet, which expands a little (from 0.355" to ~0.45") most of the time, and is able to penetrate 12" or more most of the time at 0.45" expansion.
Essentially, flatnose FMJ is a conservative choice that penetrates better than any JHP. The problem with 380 JHP is that the bigger they expand, the less they penetrate.
So I chose the XTP bullet, which expands a little (from 0.355" to ~0.45") most of the time, and is able to penetrate 12" or more most of the time at 0.45" expansion.