Originally Posted by HAMMERHEAD
Sound like a rounded edge or other imperfection on your extractor. The Volquartsen exact edge extractor had a good rep over at rimfire central, or take your chances with a replacement from Ruger.
+1 mine did the same thing then i installed the VQ exact edge extractor,
i have run close too 3000 rds thru it know with no fte, give it a try, and take a look at rimfire central, good place to learn about 10/22's, good luck.