.30-06 Springfield (thing)
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|Aka the Thirty Aught Six Springfield, this cartridge was the thirty caliber cartridge that was adopted for use in the M1 Garand back in 1906, hence the '06. Aught Six came from "Naught Six" which meant the numbers zero and six.
The 30-'06 is much more powerful than the current NATO 30 caliber round which is the 7.62mmx51 and has a NIJ threat level rating of IV which is the highest threat level. The 7.62mmx51 is rated at threat level III.
Be aware that caliber nomenclature does not make any sense and that the cartridge 30-30 means something else entirely. The first 30 does mean the caliber but the second means that it is a cartridge that is loaded with 30 grains of black powder. Like I said, caliber nomenclature does not make any sense.