This review tests Underwood's 10mm Platinum Edition Xtreme Defender against a Nosler JHP through a Glock 20. The Xtreme Defender achieved 1631 fps and 679 ft-lb energy, penetrating 22.5 inches with 100% weight retention and a massive wound channel. The Nosler JHP averaged 1422 fps and 673 ft-lb, expanding to 0.558 inches and stopping at 15.25 inches with jacket separation.
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