Thanks for the responses.

To darkker: The rifle does NOT eject fired brass reliably; this applies to new Winchester, or previously fired Winchester, Fiocchi or Remington. The new brass was appropriately sized and trimmed prior to firing; the cases in question were once fired prior to their lack of ejection.

I find that the extractor cut on the brass can very by 1-2 thousandths in diameter; in experimenting, I find that the larger diameter extractor cut brass seems to eject much more reliably.

I called Savage customer service since posting, and they are sending a new extractor, detent ball and spring. More shall be revealed...

JR