This video from Civilian Tactical provides a practical, albeit informal, test comparing the penetration capabilities of .380 Auto, 9mm, and .45 ACP rounds through a car door. The host, demonstrating high expertise, shows that .45 ACP achieved the most significant penetration, while 9mm and .380 Auto were less effective, with the 9mm being stopped by the first door. The test highlights the ballistic trade-offs between different calibers in a real-world scenario.
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