So while shooting some lacquered surplus ammo through my MN I had the bolt jam up really well.
Finally got it opened again (with some help from 7.62.net ) and cleaned the chamber with a 12 gauge brush wrapped in a hoppes 9 soak patch.
I read several posts about using deleading wool, which looks just like a stainless steel pot scrubber to me. Anyone use deleading wool to clean a MN chamber? Any tips?