Leave them sealed up and, if you have a need to examine chambers / headspace to such fine degrees on a regular basis, get a commercial set..

Clymer sold me a nice set of "incremental" gauges years ago and I subsequently coughed up for a similar set in .223Rem / 5.56 x 45.

These not only take the "guesswork" out of evaluating complete rifles, but tell you exactly what is happening when doing chambering jobs.