E.g. The bullet of 9×19 is 9mm wide but of a 5.56 isn’t 5.56
Edit: 5.56 not 55.6
In: Technology
Originally, you did not really buy bullets from the store…..back in the old single loading blackpowder days you bought a mold and some lead and cast your own bullets, so it was convenient to just use the measurement of the bullet. In modern times, it’s not just the bullet but the casing that has to match as well and nearly everyone buys ammunition from retail establishments so we have just had to agree on what to call different types of bullets which is why you get weirdo situations like .45-70 rifle rounds and .45 pistol bullets being wildly different and .223 and 5.56 being nearly but not entirely compatible with each other, and some bullets are say 7mm rifle rounds, but another similar sized bullet but different sized-casing might be 7.56 for example. It’s all over the place and just depends on agreed upon naming conventions in the gun community, and end users and governments…….and that gets really wonky sometimes.
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