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The +p+ loadings were developed for the uzi,
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As I recall, and I could be off a bit, it was the heavier than normal 147 gr. loads that were developed for the Uzi and other machine pistols and small machine guns. I'm not exactly sure of when this occurred, off the top of my head, but I recall that being the reason.
+P and +P+ loads have a different development history.
tipoc