Pretty simple topic. You want to have a rifle and pistol in the same caliber. But, what would be the most "logical" combinations?
Some are obvious...
Tommygun/M1911
PPSh/Tokarev
Broomhandle Red 9 with shoulder stock/Luger
But after that...
Suomi M31/which 9mm pistol?
Sterling/Browning Hi Power?
What other possible combinations are there, keeping in mind the desire to use same caliber in both.