Because you have a 12 gauge as in a talking shotgun and then you also have a 12 gauge as in a 12 gauge needle which are two completely different sizes but gauge is a unit of measurement so how does that work
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They’re different units of measurements. A firearm gauge is determined from the weight of a solid sphere of lead that will fit inside the barrel. So for a 10 gauge, a 1/10th lb ball fits in the gun.
For needles the number is a bit more arbitrary and is just a random measurement used by medical companies.
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