Here's a trial balloon I'd like to float.
What say all of you?

- Purchase a go gauge from a reputable manufacturer.
- Look at the Saami spec diagrams available on the web, and determine the difference in size between max and min headspace dimensions. (for a lot of calibers it is .01")
- Take a feeler gauge of that thickness and draw a circle using the base of the go gauge as a template.
- Cut the feeler gauge and using a power sander with fine sandpaper, grind the edge down until it is a circle the same size as the end of the feeler gauge.
- Stone the feeler gauge to remove the burr on the edges from cutting and sanding.
- Put a dab of thin oil on the end of the go gauge and the feeler gauge will stick right on and then you can use that as a calibrated no-go gauge.
- Don't use too much oil or too thick of an oil or you will end up with a measurable thickness of oil that will make your gauge too long.[/list]

It takes about 5 minutes to fashion one using a 1" belt sander. Since I am using feeler gauge stock and can measure it before and after, there is less chance of error than with tape.

Ok, guys, what's the downside? What am I overlooking?