This video presents a ballistic gel test of Hornady 223 Remington 55gr GMX ammunition fired from a 16-inch Rock River carbine with a 1:9 twist rate. The test reveals significant expansion, a large temporary stretch cavity, and a penetration depth of 21.4 inches. While the ammunition shed one fragment and had a short neck, its rapid expansion and disruption capabilities are highlighted as desirable characteristics, potentially attributed to its 'barrier blind' design.
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