I've ran into something I've never experienced before with any rifle in the Ruger Hawkeye 6.5 Creedmoor I've mentioned on here before. After about thirty five rounds of absolutely no problems, very accurate, loaded fine with New Lapua brass I had a round not chamber. Thought that was odd so I tried several rounds and none chambered. I came in the house, grabbed a piece of fired brass would not chamber, grabbed a new piece of brass would not chamber, full length resized new brass still would not chamber. Cleaned the rifle with Boretech carbon eliminator still nothing will chamber. Grabbed my bore scope and looked in the chamber and all I can see that might be the problem is a tiny blip, a pimple if you will, looks like carbon, rounded over right at the end of the chamber before the beginning of the throat. Very hard to get my bore scope to focus well right there, but I cannot see anything else. Any suggestions on cleaning a chamber? Is it possible there's a slight burr there that collected the carbon and will that wear down or should I have Ruger look at this if I get it clean and can see somethere there?