For example, why 5.56mm and not just 6mm? Why 7.62mm instead of just 8?
In: Technology
Bullets are measured either in caliber or in metric.
In caliber the decimal is a percentage of an inch. so a .45 cal bullet is .45 inches wide.
Metric ones use mm to describe it so a 5.56 is also a .223 bullet (for historic reasons these actual measurements are almost never the actual 100% ones)
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