Dusty: The Star 9mm pistols chambered in the 9mm Largo are not designed to shoot either the 9mm Luger or the 38 Super. If your pistol has a 9mm/38 cailber marking on the side it will handle both the 9mm Largo and the 38 Automatic - the 38 Super runs at a much higher pressure than the 38 Automatic although both are dimentionally identical, but the Super should not be used in pistols chambered for the 9mm Largo or the 38 Automatic.
You should not use or fire the 9mm Luger in pistols chambered for the 9mm Largo as the cartridge is held in place by the extractor which will break, in fairly short order if you fire 9mm Luger ammo.
There should be a bunch of 9mm Largo ammo still available out there, even though the stuff is old and may not be reloadable. If you reload however, you can use new Winchester 9x23 brass or any of the 9mm Largo brass case offerings from places like Starline or Grafs, and load your own. The 9mm Largo can be loaded with 115-125 gn ball to about 1200'/sec and be safe to shoot for both you and the pistol. HTH.