Cartridge names have little or nothing to do with the barrel or bullet diameter. From the name "9 mm Parabellum" alone I would only deduce the diameter was somewhere between 8 and 10 mm. You have to dig a little deeper to find the mominal size and tolerances for these diminsions.
Examples:
400-360 Purdy .367 bullet
400-360 Westly Richards .360 bullet
600 Nitro .620 bullet
375 H&H .375 bullet
30-06 .308 bullet
308 .308 bullet
38 Special .357
44 Special .429
32 ACP .311
7.62 Nagent .295 (7.62 mm = .300")
7.62 Tokarev .308 or larger
etc.
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