Sorry but if you want to measure chamber depths stick to a graduated plug gauge. As a wise American once said "If it aint broke dont fix it."
Gunman;
Once more "READ" your own post. There simply is no way to read into that anything other than you were saying the plug is the "ONLY" way to do it properly. That is the entire post quoted. Nice to see that you yourself do not follow what you said, but use other methods as circumstance dictate. Never-the-less from the above quote it did need to be pointed out the plug gage was NOT a Cure-All method which was infallible.
Remember everyone who monitors this board doesn't have the years of experience measuring chambers which you do. That post left the impression one could simply stick one of the chamber plug gages into any shotgun chamber ever made & if it came up short it needed "Fixing". That is not necessarily so. IF a 2 3/4" chamber "Gages" 2 9/16 just because it is .001" undersize "It Don't need Fixing".