Since I started to full length resize my brass VS neck, I'm getting the common shiny ring around my brass just ahead of the case head due to FL/RS and are wondering how one tells the difference from a ring from FL resizing and case stretching so I will be able to scrap a piece of brass and avoid suffering a case head separation incident. I use a stainless steel dental pic(the type used to clean teeth) to check the inside of my brass at the suspect area of the case head, but as I never have actually found apiece of brass that had stretched to the point of nearing case head separation, I'm not exactly certain what it should feel like. When I check I first run the pic on the inside of a new never fired piece of brass and then the fired pieces of brass in hopes it will allow me to recognize by feel any difference in the brass due to stretching, but as I have yet to actually find a piece of brass that has felt different to the point I'm sure it has stretched I'm concerned my brass will still be safe to reload once the number of times fired gets above 4 or 5x. YouTube videos are awesome VISUAL aids but not so much when it comes to tactile aid. Thanks, DJ/Art.