Here is a youtube video I found of the Speer Gold Dot .380 from a 2.75in LCP. I carry Winchester in my P3AT Kel Tec 2.75" and Fed HST 180gr in my CM40 Kahr 3.1", but I think I will switch to GD's in my .380 after this video. Many say that a .380 JHP is too weak to penetrate bone and continue much further, this shows other wise.
Warning, test was done with a hogs head.
Hog's Head Ballistics - Speer Gold Dot 90gr .380 ACP - YouTube