I had a problem with one of my 243's and the problem was a itsy bitsy tiny brass burr on the extractor where the brass rim goes. So taking off the extractor and cleaning it well worked. But also had another Savage rifle that needed a new extractor to fix the problem.

Had a few other Savages with the odd failure to eject (brass falls in the chamber) and stretching the ejector spring or installing a new ejector spring fixed the problem.