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I have never come across any +p cases that were any different from the regular cases except for the "+P" inscription. "+P" ammo is nothing more than a marketing ploy. It is simply ammo loaded to the higher end of the SAAMI spec. for that particular caliber. Because of liability and other issues ammo companies started loading rounds to the lower end of the spec. and started marketing something they called "+P" ammo. I first noticed the diminished power sometime in the early 1980's, or so.
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