Neck wouldn't be long enough. 30 Luger is 7.65x21, so the 9x19 isn't going to give you enough neck. You might be able to make it work, but I doubt it. You might be able to use 9x21 or 9x23 brass to make it work. But I doubt you'll find loads of that a the range. You can make them from .223, and that is actually really easy. I make 30 Mauser / 30 Tok from .223 all the time. I use a redding trim die to form the bottleneck, trim and file, drill the necks out with an 'N' bit in a special jig, size/deprime, back to the trim die to file once more, then they're ready for loading. Sounds like a lot of work, but it's actually not bad at all. I do about 50 at a time, and it takes me 20-30 minutes in batch. You could do the 30 Luger the same way. And I tend to agree, that is probably what I would do if I were wanting a smaller efficient cartridge that didn't cost much to load. But P Flados wants to do his one thing. I'm all for watching the journey. I might even learn a thing or two...