Wish I had access to a chrono. and a place to use it.
With a 124gr RN Berry's or Xtreme I'm loading them to 1.155" and with the Berry's Flat Point 124gr I'm loading to 1.060".. Then before I started with the AA#2 the only load I found to work well with a 100gr Xtreme 380 was with the Silhouette. The HP-38 looked more like a shotgun pattern.
I also use a lot of HP-38 in the 9mm. I wanted a bit slower powder and at the time I found the Western Powder labels had the most comprehensive listing of load data for plated bullets. Also we do a lot of shooting indoors and this powder is flash suppressed and listed as one of the selling points. Honestly, the first time we shot this indoors we could immediately notice a difference in the air quality.