I had the same problem with my encore 209x50. I called T/C and was told to use Number 13 Black Powder Solvent from T/C to swab between shots and the crud ring will be gone. I did and it worked. T/C also developed a new style breech plug with a deep dish type face to eliminate the problem or at least tame it down. If you send your plug to T/C, they will replace it with the new style for free with a one day turn around. Mine will be here tomorrow. I'll let you know how it shoots and loads with the new plug. By the way, I usually spit patch between shots anyway, so swabbing isnt that much more hassle. After all, if you keep your stuff in order and ready when hunting, it would only add a few seconds. WalMart sells the #13 cleaner. Pete