This video provides a detailed ballistic test of Underwood's 155 Grain XTP .40 S&W ammunition, fired from both a Glock 27 (3.5-inch barrel) and a Glock 22 (4.5-inch barrel). The instructor, with clear expertise in firearms and ballistics, demonstrates the ammunition's performance in gel blocks behind a heavy clothing barrier, measuring velocity, expansion, and penetration. The results indicate excellent performance for self-defense, with consistent expansion and penetration across different barrel lengths, though the shorter barrel of the G27 produces more noticeable recoil.
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