Originally Posted By: pooch
You could call wall thickness a gauge only if they were of a consistent thickness over the length of the barrel and that thickness were set against an agreed upon standard.


Ha, never thought of that. I suppose we use the term bore like we would for pipe or cylinder bore in plumbing and engineering.
Would you say the term gauge came about through the use of plug gauges to determine internal diameters ?

Rust never sleeps !