I have had very good results with Volquartsen’s Exact Edge Extractors, especially in rimfire rifles. Now they are making a new version for the popular S&W M&P 15-22.
The Exact Edge Extractors are EDM cut from A2 tool steel. They are hardened. Volquartsen optimizes the geometry to improve extraction and I have been able to use these to improve extraction other finicky rimfire rifles.