Charles,
I have used many pounds in 9mm major. I think Silhouette is a much better when loaded at or close to major in 9mm. The lighter loads will likely be very dirty but they should work.
Ramshot data for a 124 FMJ shows 4.9 grs at 1009 fps and 5.6 grs at 1105 fps.
I have chroned these loads out of my open gun with a 124 Montana Gold, 5.5 at 982 fps and 6.5 at 1165 fps. These were loaded to 1.170 oal.
Hope this helps. If you were closer I would trade several pounds of Titegroup for Silhouette!