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No, Hornady does not use an 8-inch barrel for its advertised ballistics for Critical Duty ammo. Hornady's advertised ballistics for Critical Duty ammunition are generally based on a 4-inch barrel. Critical Duty is designed and optimized for use in full-size service pistols, typically with barrel lengths around 4 inches or longer, to achieve consistent performance and meet FBI barrier penetration standards. For comparison, Hornady's Critical Defense line is optimized for short-barreled concealed carry firearms, typically those with barrels under 4 inches.