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The .357 Sig is one of many cartridges whos nominal bullet diameter is not based on actual bullet diameter. The .303 Savage is another, though a few of the early .303 Savage rifles had bores closer to .310-.311.
The various .221, .223, .224, etc cartridges that all use the same bullet size are examples, while the .22 Savage HiPower uses a .228 bullet but is simply refered to as a .22.
If they'd called the .357 Sig a 9mm magnum rimless it wouldn't have had the same level of sales appeal and would be easily confused with the 9mm Winchester magnum, which is a very different cartridge altogether.
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