After reading a bit about the FBIs fabric/gel penetration tests I wonder now if expansion even matters. The thinking seems to be that if you put a hole in the vitals you've done an effective job. Thus maybe a .380 that doesn't expand would pass the test. Or a .45 for that matter.
I mean if passing the FBI test is the goal why not use a solid lead bullet of sufficient weight and velocity, then you dont have to "hope" the bullet expands.