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Hi,

One of several meanings of gauge is:

1: The size of a shortgun barrel's inner diameter nominally expressed as the number of lead balls each just fitting that diameter required to make a pound.

or

2: The gauge or bore is determined by the number of solid spheres of a diameter equal to the inside diameter of the barrel that could be made from a pound of lead. (according to wikipedia)

I couldn't understand any of above definitions so please help me.
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For a 12-gauge shotgun: if a pound of lead (Pb) were melted down and formed into twelve identical lead spheres, the spheres would have a diameter equal to the diameter of the inside of the gun barrel.
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Mister MicawberFor a 12-gauge shotgun: if a pound of lead (Pb) were melted down and formed into twelve identical lead spheres, the spheres would have a diameter equal to the diameter of the inside of the gun barrel.

So, MM, the gauge is also a reflection of the total volume of the barrel or the total load/charge, not only of the diameter?
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Comments  
Not according to the definitions given; the gauge designation is generated merely by how many spheres can be created of the given diameter. It states nothing about volume-- after all, a pound of lead has the same volume for all gauges.
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OK, I've got it: all those spheres can be created from the pound of lead, but they aren't all supposed to be to be contained by the barrel at the same time, thus gauge is a measure of the diameter indeed, and not of the total interior volume of the barrelEmotion: smile

Thus, for the OP:

ooooooooooo
shows a smaller gauge (more spheres, represented here by "o," can be created from a pound of lead)

OOO
shows a larger gauge (less spheres, represented here by "O," can be created from a pound of lead)

Emotion: smile