This expert guide details the ballistic performance of IMI's 77gr OTM 5.56x45mm ammunition, a clone of the Mk 262 Mod 1. Tested with a 10.5-inch SBR, the round demonstrated deep penetration (16.2 inches), significant expansion (0.539" max), and high retained weight (53.9gr) with an average velocity of 2439.60 fps. The instructor assesses it as an outstanding home defense choice due to its wounding potential from short barrels.
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