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Old May 5, 2005, 08:32 PM   #3
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Join Date: February 16, 2005
Location: Charleston, WV
Posts: 302
From what I understand (please someone correct me if I am wrong), +P stands for PLUS PROOF. Proof (I think) would be the SAAMI or manufacturers (not exactly sure which) absolute limits of what the paricular firearm can stand as far as chamber pressures go. In other words, I think that +P are "test" pressures.
+P+ is obviously an even higher pressure for that particular cartridge.
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