Ok I have this bolt action but I can't seem to get a leverage on this space about 5 inches from the nearest opening. Do you think bore foam would disolve the carbon build-up?
FYI, Foaming bore cleaners don't dissolve carbon. They turn it into something resembling ceramic. Try MPro7 to cut carbon. After you clean with foam and are sure the barrel is clean, give it a healthy scrubbing with a brass brush and good old Hoppes #9. Run a patch through, you might be surprised.