After doing some studying in the Quickload software, I went to town with a list of suitable powders going by the pressure numbers in the software. The only powder I was able to find locally was Hodgdon Longshot, and a load of 3.8 grs has given me an average of 823 fps in the full-size Beretta (SD 15), and 798 fps in the PX4 Compact. There was no keyholing on the targets and the primers looked normal. There was a storm coming so no time for in-depth testing, but for now it looks like I have a powder that solves the previous problems I was having.