According to Circle Fly, 13ga. is .710" Since I can't find any published dimensions for Chambers, I'd be more inclined to rely on the info that is published, i.e., Bore dimensions.
I applaud your enthusiasm, and know well what you mean by being impatient, but using dowels, sanded PVC pipes, etc, to attempt to find something that is measured in .001" is akin to using binoculars, when a microscope is called for.
Why don't you let us know where you live, and perhaps you might find a PGCA member close by who owns a Chubb, or similar bore gauge. I have one, and live in N.Central CT.
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