Hey guys. So I'm a little confused with my recent build. I rebarreled my model 111 with a Shilen Select Match barrel and used PTG go and no-go gauges to set the headspace correctly. The bolt closes on the Go gauge and not on the NoGo gauge. But when I took the rifle to the range to test it, I noticed a slightly protruding ring around the cases head. Everything I read says it's a sign of too much headspace but how is that possible if the Go an NoGo gauges check properly?