I've found Titegroup to be excellent in .380 ACP. The 3.4gr load is listed as maximum by Brian Pearce in loaddata.com. I've used the Sierra 90 JHP bullet, which has a longer bearing surface than the Hornady 90 XTP. Overall loaded length 0.940"

M&P Bodyguard 380
3.2 grains 904 fps SD 12
3.4 grains 980 fps SD 8

Kel-Tec P3AT
3.4 grains 958 fps SD14

Glock 42
3.4 grains 984 fps SD 24

Maxiumum loads with Power Pistol will top 1000 fps, but accuracy suffers.