I don't recall where I got the data. I'm certain someone here. Awesome load. 10MM 8.3 gn Blue Dot under a 155 gn FP extreem seated 1.250. It is a boomer at an indoor range. I don't think I'll stick with it or at the very least I'll keep 50 or so on hand just for that boom factor. Muzzle flash and report were excessive. It was a lot of fun to shoot I'll admit but practicality.... I know there are powders better suited to 10mm. I just don't happen to have any currently. Do you have a favorite noise maker/head turner? Something flashy and loud for the sake of being flashy and loud? Even the staff asked when I was leaving what I was shooting. Enjoyable trigger time today.