The 8.6 Blackout significantly outperforms the .338 ARC in barrier penetration, demonstrating superior performance against concrete and mild steel. Its 1:3 twist rate enables impressive bullet expansion and wound cavities, especially with subsonic loads, while the .338 ARC struggles in these areas. The 8.6 Blackout also benefits from standard AR-10 magazine compatibility, offering higher capacity than the .338 ARC's reliance on .400 Legend magazines.
This video tests the penetration capabilities of various 5.56x45mm loads against different steel targets, including AR500 armor. Standard loads like M193 and M855 show varying success, with M855 penetrating 3/8-inch mild steel but failing AR500. The RUAG 5.56 AP TC with a tungsten carbide core demonstrated the highest performance, nearly penetrating 5/8-inch mild steel and significantly damaging AR500.
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