If chambering a rifle for a caliber I don't have access to headspace gauges for I sometimes use a factory cartridge with one thickness of tape on the head for a go gauge and enough thicknesses to make the normal difference between the gauges for the no go( usually .003 or .006"). I usually use masking tape because it is "on hand" and easy to trim to fit the head. The same idea as Keith's, different material ( this is a "make do" solution, not the preferred one). Be sure the cases you to fire form with a European case rather than a smaller American one.
Mike
