Gun Slick or Wipe Out foaming bore cleaner is what I use. Let it sit in the chamber and bore for a while, swab out the chamber and bore with alcohol soaked patches, follow with a couple of dry cotton patches and you should be good to go.
Another method would be to purchase a chamber brush tool used on the 30-06 M1 Garand. They don't cost much and they will definitely get the job done.
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