I carry a Glock 23, Serial # EBVxxxUS, and closely examined brass revealed a .12 "bright ring" just in front of the ejector cut, and the remaining forward portion of the brass is duller and shows chamber scuffing. I surmised that the "bright ring" was in the unsupported chamber area so I checked for bulge with my calipers. To my surprise, the "bright area" had no buldge compared to the midway portion of the spent brass! This is Remington 155 gr. factory ammo. I like the Glock 23, but have been concerned about the "kaboom" possibility. Can anyone share their opinions as to why the "bright area" and the bullet crimp area has LESS buldge than the midway area of the spent brass?