Two thing you can do. Get an improved extractor kit from Sharp Shooters Supply
https://www.sharpshootersupply.com/
and replace the extractor steel ball with a .140.
http://www.savageshooters.com/showth...or-detent-ball
These mods will help however, the real issue is that once the 223 cartridge case mouth exits the breech, it slams against the bolt abutment (frequently denting the case on the sharp corner) and it is this jarring that causes the extractor to let go. Moving the bolt rearward quicker helps, as you've noticed, but the heavy spring on the ejector and weak extractor spring are big factors. You can clip a loop or two off the ejector spring too and see if that improves the ejection.
I removed the ejector from my 223 for target use. Made more sense than constantly chasing my carefully prepared brass. If going hunting, I simply put it back in.
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