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Anti-materiel rifles like the steyr HS 50 AM are chambered for .50 BMG (12.7x99mm NATO) cartridges. The Steyr IWS 2000 can handle 15.2 mm proprietary Steyr APFSDS. Generally anti-material rifles are chambered for 12.7x99mm NATO (.50 BMG), 12.7x108mm Russian, 14.5x114mm Russian, and 20mm cartridges.