Ron:
Feeding from the mag with the short .221 Fireball has always been a problem but if you got it to work for you, good deal.
Extraction is another issue as the case is too short and just about anything you try doesn't help. The case will pop off the bolt head before it clears the action port.
Consider removing the ejector rod and spring. That way, it will feed from the mag and when extracted, the case will stay on the bolt head till you pick it off. Not the best of both worlds but just might get the job done?