Some caliber in metric come from the convertion from imperial dimension. But for most of them, the main reason is that the caliber of the ammunition is like thier brand or model. It need to be unique so that people don’t confuse them with another similar but different ammunition. If all ammunition would be round up, you would end up with hundred of ammunition with the same number, that’s bad marketing. It just make it harder to the consumer to find the specific type of ammunition his weapon use.
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