I though this was worth posting because M855 is normally perfect for Appleseed shooting.
Symbol Number: ZGQ3308 Lot Number: WCC10M106-004
Apparently some in this batch got out with the wrong propellant. Winchester will ship replacement ammo directly to you.
http://www.snipershide.com/2013/02/winchester-recalls-lot-of-m855-5-56x45mm-ammunition/