45 Auto +P

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The 45 Auto +P is designed with the same external dimensions as the standard-pressure cartridge. The +P headstamp is what designates cartridges loaded to a higher maximum internal pressure. The difference between the standard 45 Auto and the +P is the inner dimensions creating pressure of 23,000 psi, whereas the standard 45 Auto is 21,000 psi.

AmmoFast carries the standard 45 Auto and the 45 Auto +P in many high quality brands, such as Federal, Hornady, Speer and Winchester.