"For a moment he felt good about this. A moment or two later he felt bad about feeling good about it. Then he felt good about feeling bad about feeling good about it and, satisfied, drove on into the night."
-- Hitchhiker's Guide to the Galaxy --
I wouldn't advocate using JHPs in anything below 9mm energy levels (i.e., around 300ft-lbs).
Everything I have seen seems to indicate that rounds in the .380 ACP range -- generally under 200 ft-lbs -- lack sufficient energy to provide both penetration and expansion reliably. If they expand, they generally fail to penetrate. The aforementioned hydrashoks do come closest, but just barely.
I'd far rather have a round that I know will penetrate sufficiently as a rule, and as such would lean heavily towards FMjs in such a gun.
Considering the crappy sights and overall poor "shootability" of most pocket .380's, they are screw it into the bad guys ear and pull the trigger pistols.
So just about any ammo that feeds reliably will work.
What I have found is the "premium" JHP loads tend to have better quality control then the FMJ "target" loads.
I would not get wrapped around the axle with jello results when it comes to mouse calibers, they all suck.
Again, from what I've seen, many premium .380 JHP loads struggle to make 9" of penetration if they expand (that's what she said), while even target FMJ loads will easily break 16".
The whole FBI rethink of the early 90s was because their 9mm Silvertips failed to provide adequate penetration with while expanding, and those carried far more energy than even the hottest .380 loadings.
The whole FBI "rethink" was due to taking a snubbie to a rifle fight.
I'm just not that worried about a few extra inches of penetration out of a 2" barreled .380 with no sights.
10.5" penetration, .54" expansion through 4-layer denim works just fine when you screw the barrel into their nostril and press the trigger repeatedly.
It's a POS mouse gun...
What does anyone think about the Buffalo Bore-Barnes .380 +P? According to their website, they say a Kel Tec P3AT would get around 1130 fps. Not sure what this would mean in terms of penetration, but I would think it would be more than 993 fps offered in the Cor-Bon DPX...?