So for light subs faster powers are better for a couple reasons. One is powder position in the case doesn't matter. The other is that they are quieter as they are not burning as the bullet exits the barrel.
I wouldn't hesitate to use any of the data or powders I sent ya in this link. During the powder shortage I was looking at 700x pretty closely but things eased up and I found Unique. I also like TiteWad but it is one you have to be super careful with due to tiny case volume.
http://www.gmdr.com/lever/lowveldata.htm