In 200 round battle packs:
http://www.targetsportsusa.com/pmc-bronze-ammo-223-remington-ammo-55-grain-fmj-223a-bp-p-54119.aspx
http://www.targetsportsusa.com/pmc-bronze-ammo-223-remington-ammo-55-grain-fmj-223a-bp-p-54119.aspx