In my experience, it's hard to beat Accurate #2 for lead or jacketed bullet loads in the .380 Auto. I had some HP-38 once (the same powder as W231), and traded it away because it was a dirty burner at the reduced pressures I was using. However, the guy I traded it to loved it in 9mm Luger.
I load my Tennessee Valley 95gr LRN bullets to .950" COL using mixed headstamp brass at .675", CCI 500 primers, and a light taper crimp (just enough to remove the flare). 2.7 gr of AA #2 gives me 830 fps out of my 3.5" Bersa 95, and 840 fps from the 3.8" Beretta 84. Very accurate, clean burning, and fun plinking. The brass usually ends up in a small pile just to my right.
I've gotten similar performance from VV N310 (2.3gr), and Titegroup (2.7gr). I stopped using Hodgdon Clays for this application because at these light weights it tended to bridge in my Lee Pro Auto Disk, giving me the occasional very light throw.
For jacketed bullets in .380 Auto, check out the Speer #14 manual. They've got data for their 90gr GDHP and 95gr TMJ bullets, and I've been very impressed with how accurate their data has been in my guns. The .380 Auto is one of those cartridges where it's easy for a handloader to meet or exceed factory performance (the standard is a 95gr jacketed bullet at 950 fps for 190 ft-lbs) and still stay comfortably beneath SAAMI maximums.
