Most of my breach-plugs, can be removed with the fingers. Sometimes a large nail, or similar metal rod is needed. Sounds like yours has been sealed against moisture. One more thing, always check old muzzle loaders, to see if they are loaded. At least 1/3 of the ones I have handled over the years, were. Drop the ram-rod down the barrel, and then mark it to see how deep it goes. Should go at least to the touch hole.
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