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Plus-P means the cartridge is loaded to a higher compression. In short, it means it has more powder and will have higher velocity than a similar cartridge that is not plus p.

Specifically, +P is loaded to up to 10% higher pressure than SAAMI standard. if a standard 9mm luger round has a pressure limit of 35,000 PSI, then a +P load has a limit of 38,500. +P+ is anything higher than this limit, theoretically up to the proof test loading of 130-140% of standard pressure.
Xtra power,or + powder= more BANG! Make sure your weapon is rated for it!

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10y ago

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