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I thoroughly cleaned my barrel, scraped the breech too. Also the vent liner. When I got done, I stuck my tiny bore light into the vent hole. (Light from a night fishing bobber. To my surprise, it looked like the light was ahead of the patent breech cavity. I have enlarged my vent liner hole to 5/64.

I have the original lock on my TC, it sure may be contributing to the problem, as it eats flints. I will search for a 2nd generation lock. I’m going to continue to wipe between shots, but use the correct jag and patch.

I also live in Georgia, and high humidity is surely adding to the problem.

I’ll get it sorted out and report back.

Thank you all for the tips and advice.

I will also go back to spit patches for a time to see how effective it is.