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It is one of the most popular calibers due to its affordability and availability. 9mm Luger (9x19mm): A widely used pistol caliber for self-defense, law enforcement, and military applications. Known for its balance of recoil, capacity, and stopping power. .45 ACP: A larger pistol caliber known for its stopping power, commonly used in 1911-style pistols. .223 Remington/5.56x45mm NATO: A rifle caliber used in AR-15 platforms.