Drat, drat, drat, drat.
Ten years I had a Series 70 Combat Commander in 9mm Luger that would only feed hardball. When a hollowpoint hit the almost vertical barrel throat on it, the hollowpoint edge at 6 o clock would lock the shell in place. This was the second one I tried to make work over the years. I had about 10 Colt mags and 8 Pachmayer mags in 9mm, so I hated to rebarrel to 38 super. All those years, and all along I wanted a 30 Luger, and I never put it together! I could have just dropped a new barrel in and used the old mags and only maybe ( probably ) putting in a lighter recoil spring. I finally sold it last month with a 17L Glock. *Now* I think of it.
But not to worry. I have a brand new two tone HP Practical new, unfired and untouched in the box since the 94 ban until I pulled it out yesterday, and umpteen factory hicap mags. And now they have all those 32 acp hollowpoints the right diameter for the 30 Luger.
Anyway, you ought to be able to find a nine that can have it's barrel replaced that doesn't have much strength needed to work the slide, less if the 30 needs a lighter spring.