![]() 9mm Parabellum Max Pressure (SAAMI): 35,000 PSI.300 Blackout Max Pressure (SAAMI): 55,000 PSI. ![]() All that extra powder translates into a higher maximum capacity: This is not surprising, considering the amount of powder 300 Blackout holds in its casing compared to 9mm. Overall, 300 Blackout performs with better velocity and more power than 9mm when supersonic loads are compared. The heavier grain of the 300 BLK yields more energy, producing approximately 32% more force. Comparing 147-grain 9mm and 220-grain 300 BLK, we get almost identical muzzle velocities (1,010 FPS vs 1,073 FPS). Subsonic Comparisonsģ00 Blackout and 9mm provide substantially similar performance when fired in a subsonic configuration. But keep in mind, these comparisons are made with a 16" barrel. That extra velocity translates into significantly more energy: 300 BLK punches with nearly three times (272%) more pound-feet at the muzzle. On average, 300 Blackout and 9mm supersonics provide similar grain weights (125 grains vs 115 grains beyond two common loads), while 300 BLK maintains a velocity that is approximately 45% faster at this weight.
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