So the only gun, I think, to chamber a .30 Luger was a Luger
I know of another handgun that was available in .30 Luger. That was the Browning Hi-Power. I found a magazine for one in a gunshop "junk box" and bought it for $5. Gave it to a friend so he could sell it on Gun Broker and keep the profit. I'll have to ask him if he did....
Who sees he is about to hit 4-digits in number of posts.