ONE LIVE 50 BMG BALL. HEADSTAMP SBS 0 7. SBS headstamped .50 BMG ball rounds that were produced under the “second source” contract for the DoD. Santa Barbara Sistems of Spain was purchased by General Dynamics to fulfill DoD needs for ammo that LC and WCC couldn’t fill. SBS 07 headstamped, purple opaque water-based primer sealant (like what LC uses), 3 stab crimp. Knurled bullet crimp cannelure.