You are right about the cock on closing feature - it easily makes you think something is hanging up when chambering a round. You say, however, that extraction was fine so the extractor must have gone over the rim of the shell. Work the bolt with no round present so you can get a feel for the cock on closing action. Then run a brass brush into the chamber to see if there is anything that would block a shell. If a shell now chambers with no additional resistance you are good to go.
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