This expert-level guide details a comprehensive ballistic gel testing procedure for .357 Magnum ammunition, specifically focusing on Underwood's 158-grain XTP load. The test, conducted by an experienced firearms instructor, evaluates velocity, penetration, and expansion through a realistic clothing barrier using both a 2-inch Taurus 605 and a 4-inch Ruger GP100. The results highlight the impressive performance of this ammunition, particularly its expansion and energy transfer, even from shorter-barreled handguns.
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