I've used 700x for 30 years in the 380 ACP up to the 45 ACP and several in-between. It works OK, and years ago was considered a "clean" burning powder, at least cleaner than Bullseye. It just doesn't meter as consistently as some others available because it's a large flake powder. It's primarily used for 12 gauge target loads and I've loaded many thousands of them with this powder. It's not my go-to powder for handguns, but it'll work. BTW, all powders are "dirty" to some extent. That's why we have cleaning rods, solvent, patches, etc. I clean after every shooting session, so dirty powder is no problem. I use a lot of Unique, too, and that's a dirty, but outstanding, powder.