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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Y’all are really going into the weeds on shotgun gauges. Shotgun gauge is hillbilly math.
Shotgun gauge is determined by how many lead balls of that barrel diameter would equal one pound. A lead ball with the diameter of a 12 gauge shotgun barrel would weigh 1/12 of a pound.
This is why shotguns with smaller barrels have a high gauge. A 20 gauge shotgun would require 20 lead balls to equal one pound, while a 10 gauge shotgun would only require 10 lead balls to equal one pound (because the barrel is roughly twice the diameter of the 20 gauge).
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