Order .50 Cal. BMG Federal American Eagle XM17C 618 Grain Tactical Red Tracer Ammo at Ammunition Depot. This .50 BMG Tactical Tracer is for observing fire, signaling, target designation, and incendiary purposes. This .50 ammo is made to US Military Specs by the Lake City Army Ammunition Plant (LCAAP). This ammo is made with Lake City brass - Brass cased, boxer primed, non-corrosive and magnetic. This round has a mild steel core and comes packed in 10 round boxes.