Rifle Headspace Gauge Facts and Lies

I did a video in 2013 about the Lyman Headspace Gauge for .223 and had a recent viewer comment on it. I therefore did a review of other You Tube videos and was really surprised at how many people just did not understand how to use the gauge. They come with instructions but I guess nobody bothers to read them. This video is to help the reader understand what these gauges are for and what they are not for. I don't claim to be an expert but I can read instructions.
I do these videos for fun. Please refrain from nasty comments. I welcome constructive comments. I don't care if you follow my videos or not. I take no responsibility for any possible injuries resulting from your reloading skills or lack thereof.