This expert-level review details a comprehensive ballistic gel test of Hornady 9mm Subsonic 147gr XTP ammunition. The test, conducted by an experienced firearms instructor, highlights the critical role of velocity in achieving reliable projectile expansion, particularly with XTP bullets. Results from two handguns with different barrel lengths (3-inch and 4.5-inch) demonstrate that subsonic velocities may not be sufficient for optimal performance, leading to significant over-penetration and minimal expansion.
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