For example, why 5.56mm and not just 6mm? Why 7.62mm instead of just 8?
In: Technology
Caliber is an imperial unit of diameter measured in 100ths of an inch.
So .25 caliber is 1/4 inch and .50 cal is 1/2 inch.
Why then is a bullet measured .310 called .303 british? I dont know.
So why not whole numbers? To differentiate them. For example 7.62 Argentine, 7.62x54r, 7.62×39 Warsaw, 7.62 Nato. Absolutely none of these bullets are interchangeable. Naming conventions! Helpful.
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