In response primarily to Castaway, I'm looking for a powder that will give decent velocity and accuracy that won't gunk up the barrel to the point that malfunctions occur. Using AA #7 I can shoot sixty, maybe eighty rounds through my Sig P229 before it begins to fail to go fully into battery. Then I have to stop and clean the crud out of the chamber area. I don't like that.
When I first began reloading for pistols some five-six years ago I had a supply of Winchester AA 473 on hand which I had been using in my shotgun. There was no pistol data for it that I could find. By careful experimentation I got loads that worked very well in all three calibers that I load for, 9mm Luger, .357 Sig, and .40 S&W. I use a chronograph and have never been able to equal the uniformity I got with AA 473. Standard Deviations less than 10 and extreme spread over 20 shot groups of 30. That and very, very, clean burning with no malfunctions even after a couple of hundred rounds. Unfortunately for me, Winchester quit making AA 473.
I'm looking for something similar.