Read the ATF Notice:
http://www.atf.gov/sites/default/file…

Send your comments to the ATF before the March 16th deadline:
[email protected]
Fax- (202)648-9741
Mail- Denise Brown, Mailstop 6N-602, Office of Regulatory Affairs, Enforcement Programs and Services, Bureau of Alcohol, Tobacco, Firearms, and Explosives, 99 New York Avenue, NE, Washington, DC 20226: ATTN: AP Ammo Comments

Find your Representative in the US House using your zip code:
http://www.house.gov/representatives/…

Find your Senator:
http://www.senate.gov/general/contact…

Join the NRA:
https://joinnra.nra.org/join/join.aspx

Tell the NRA to pressure Congress to exempt rifle ammunition from the LEOPA of 1986:
https://contact.nra.org/contact-us.aspx