I believe as of Oct 2010 you are covered under LEOSA Link Removed
From FAQs on link provided.
However, recent amendments to the Federal law do extend the exemption to allow the carriage of ammunition “not expressly prohibited by Federal law or subject to the provisions of the National Firearms Act.” This means that qualified active and retired law enforcement officers may carry ammunition in States which may have prohibited the possession of certain ammunition by persons not actively serving in law enforcement within that State. :yu: