This video from Kentucky Ballistics provides a practical, hands-on comparison of .40 S&W and 10mm Auto calibers using modeling clay as a ballistic medium. Expert Scott demonstrates the terminal performance differences between FMJ and JHP ammunition from Underwood Ammo, fired from a Glock 20 Gen 4. The testing highlights the superior energy and penetration of the 10mm Auto, while also showing the expansion characteristics of JHP rounds for both calibers.
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