When reloading a 9mm 115gr FMJ type bullet with w231, I get very low yellow MF to none...........
However I do not know if Winchester uses this powder in their "Factory SD" ammo, sold to the public?

I do know that the higher priced Federal HST does have and use a low flash powder in its SD loads for the 9mm and you can search the web and find pictures of the amount of flash against other ammo.