This review tests the Liberty UltraDefense USM4 9mm ammunition. The 50-grain lead-free projectile boasts a claimed 2000 fps velocity and 450 ft-lbs of muzzle energy. While demonstrating impressive wound cavity potential in ballistic gelatin and performing well in a 4-inch barrel pistol, it failed to reliably cycle a short-barreled Walther PPS due to insufficient energy.
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