You have a Gen 4 9mm so don't try to go too light. I don't have one so I don't KNOW what is required but, generally, the guns seem to work better at NATO power levels. That would be a 124 gr bullet moving around 1200 fps.
Just something to think about if your load tends to have failures to eject.
"No matter how cynical you become, it's never enough to keep up." - Lily Tomlin