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Naming calibers has (almost) no rules, so odd numbers show up at the choice of the person that names it.

A .22 centerfire can be called a .222, .223, .224, or 5.56mm, and still all take the same bullet.

A .356 caliber could as well have been called a 9mm, or a .357. The .357 SIG actually uses a .355 bullet (true 9mm), but they wanted it to remind people of the .357 Magnum. Marketing!

The .38 Super uses a .356 bullet, so it could have been called a .356 Auto, or a 9mm Browning.

The .356 TSW cartridge is the same as 9mm, except for length.
 
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