I was using an EJS bore guide to clean my 8x57. Unknown to me, the tip, forward of the o ring, broke off in the chamber. To make matters worse, I took the rifle out to the shooting bench and tried to chamber a round before I realized the tip was in there. This really forced the tip into the leade. I've tried running a bore brush thru the barrel with no success. The hole thru the guide tip is slightly bigger than the barrel so there's not much hope of running anything thru there and snagging it. Right now I've got the barrel and action in the freezer.