I have a Ed Brown match barrel in .40s&w on a Para Ordnance that will not accept any brass that was fired in an 'unsupported' chamber, such as Glock and a few others have and they have been FL sized in Lee dies and pass the commercial Chamber Check gauge test....So a check gauge is not always a viable method...In that weapon, I have to pull the barrel and use it as a check gauge unless I'm reloading brass that was previously shot in that firearm or one with a fully supported chamber...
My .204 AR has a custom cut chamber in a 'match grade' barrel and my check gauge for that one is cut from a piece of the same barrel stock and was cut with the same reamer at the time the barrel was chambered, otherwise a commercial .204 gauge will not work either...
