Going to start with what I have powder wise. Prima V and WST. I really like Prima V because it seems to burn completely and very, very clean. Will be a work in progress.
Even with a Major compensator I could tell a difference with Titegroup loads. That's a minor Comp.
Getting 12,000 SNS 125 grain bullets this weekend. ? So will have a lot to play with. I've found that I like the .357 diameter coated bullets in my Sigs. Leaves the barrels like a mirror.