The HK Mark 23 can safely fire .45 Super, which offers significantly higher pressures and velocities than .45 ACP due to thicker brass. Chronograph and ballistic gel tests confirm .45 Super's superior energy and penetration, with a 255gr Hard Cast load exceeding 32 inches of penetration. While .45 Super is more powerful, its necessity for human threats is debated, but it excels for large game defense.
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