when checking headspace on the cases, the majority of them do not fall into the "flush" or just below flush on the headspace gage. Some are just "a hair" above. NowI did talk to a local reloader about this(reloading for 40 years), and he said he doesn't pay much attention to that. He says "as long as his case length and COL are good he's not concerned."
Then he may have not learned as much as her should have in the past 40 years.
Let me ask you a simple question, If you are not going to use your case gauge as a case gauge and are going to take advice from someone telling you not to use your gauge, Why did you purchase it and why do you still try and use it?