I've yet to find a 9mm pocket gun that is just as small as an LCP, P3AT, BG380 and so forth and still be shootable. Yes, there is the Shield, XDS, Kahr and so forth, but they're bigger and not pocketable in any of my pants.
My IWB carry is a XDS in 45acp and BG380 when only pocket carry will do. I like both calibers equally well and would have no problem carrying FMJ in either if that's all I had. As a matter of fact, when I run out of HP ammo for the .380, FMJ is what I'm going to carry in the BG380.