jschance - it does not exist (that I know of). Years ago I owned one of those Stars, and loved it. I also had a Llama as well as one of those big ol Astra 400s, all of them in 9mm/38 caliber. Loved 'em all. The only 9mm Largo ammo I know of being produced today is by CCI with the aluminum case and a 124 gn jacketed bullet.
As for something other than ball ammo, if your Star feeds and chambers the 38 Super then you can use that caliber. If you prefer to roll your own, I would use 9x23 brass, which is supposed to be the same length as the 9mm Largo, and use 38 Super loads. If you can still find it, you can also shoot the 9x23, which is what the 38 Super can be loaded to. However, if you are going to shoot that Star with hotter loads I would stoke it with a set of heavy duty Wolfe Springs in the 20 - 22 lb range. HTH. Mikey.