Did you chamber the barrel? The case should stick out about .125”-.130” (‘bout 1/8”) from chamber breech. If not, it’s been like that from the start, as the chamber doesn’t Grow longer over time.

I agree with Mikie. Don’t try to fix what ain’t broken. If you were still running the barrel nut, I’d say pull it & just hand file a few Thous off. But that dog won’t Hunt! Smellin’ what I’m steppin’ in partner?