[Redbob]

"I'm looking for a .12 gauge shotgun this year. Used of course."

Minor technical nit:
There is no decimal point in a gauge designation - that shotgun would be simply "12-gauge"; that's the number of lead balls that bore diameter you'd get from a pound of lead.

Caliber designations such as .22 or .45 (two of my favorites!) use the decimal point because they represent the bore diameter in decimal inches.
Usually.

[Fred Mertz]

"12-gauge"; that's the number of lead balls that bore diameter you'd get from a pound of lead.

I appreciate the technical correction, but now I'm more confused. What size lead shot/balls? What is the bore diameter of a 12-gauge in inches? Thanks for your patience. I think I'll Google the answer myself. Never mind.

[BikerTrash]

Minor technical nit: There is no decimal point in a gauge designation...

Extra-minor technical sub-nit:

Except for a .410 gauge.