Some times a Go-gauge can be a tad bit on the short side. That's why it's a good idea to have an actual No-go gauge too. I set one of my barrel's up head spaced on a go gauge and the bolt would not close on no go gauge, I thought I was done. No. I tried chambering a new winchester case and it was too tight. I ended up loosening the barrel nut and turned the barrel out a little and tried again, this time the bolt close with just a faint bit of resistance at the end. I tried the no go gauge again and the bolt still would not close, not even half way, hope this helps.
Bookmarks