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Same reason 0.40S&W is not called 10mm even though it is
Wait a minute. I thought the 10mm was bigger more powerful than the .40 S&W. You are saying it is the same size though? Or just the same size diameter?
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It is the same diameter bullet, the 10mm case is longer and holds more powder. To prevent confusion S&W called the new cartridge the 0.40 S&W instead of 10mm short or something like that.
Good chart on many of the different English and metric size bullets on Wikipedia
http://en.wikipedia.org/wiki/Caliber