Originally Posted by sd_shooter
I also noticed that I couldn't force the extractor to grab the case by shoving the slide forward. The recess next to the chamber (into which the extractor fits when the slide is in battery) appears to prevent the extractor edge from going behind the the rim of the case! It is as if the only way the extractor will work is if the round was properly picked up when feeding from the magazine.
The only way that it works, is if you use it as intended, ya don't say?
Rimfire guns and being picky with ammo is just a fact that you have to deal with. The mark could be a burr in the chamber, could also be the brass just hitting something on it's way out.