This video conducts a penetration test comparing 9mm, 10mm, .45 ACP, and .40 S&W calibers through wood and paper. The test reveals significant differences in penetration depth, with the 10mm and .40 S&W generally outperforming the 9mm and .45 ACP in wood, while paper penetration varied. The presenter also notes differences in bullet construction and primer size between calibers.
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