Gad lists 9mm BL.
I can't get the Quality Cartridges (qual-cart.com) catalog to download, but they would be worth checking.
Or trim .38 Super brass.
I think these are neat guns and would go to the trouble to load for one that had not been munged up to .380. But the price would have to be moderate, since I don't see a real use for it, just a nice novelty.