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+P, pronounced “plus pee,” is a recognized “overpressure” load for ammunition that SAAMI officially blesses. The institute publishes the maximum allowable pressures for these loads as well as the standard cartridges, allowing firearms manufacturers to produce guns capable of safely handling round after round of the hot stuff without damaging the gun. +P loadings are offered for the standard self defense rounds of 9mm Luger, .45 ACP and .38 Special among others.
Since +P cartridges are typically only 10% above the normal pressure of a cartridge they will work in any properly maintained gun (the proof round is still a much higher pressure), but they will wear it out sooner and increase the chances that the gun will suffer a “structural failure.” Which is code for “blow up in your hand.” So the common advice is to not use +P as range / practice ammo.
.38 Super is the exception to the rule. The +P loading for .38 Auto, dubbed “.38 super,” is a standard competition load used in USPSA and 3-gun competitions. The ammunition is loaded much, MUCH hotter than the typical +10% and almost becomes its own caliber. This is the only +P loading that I would stay away from for novice shooters.
+P+ or “plus pee plus,” is a loading above the already over-loaded +P designation. This is for people who don’t think that +P is enough “stopping power” and want even more. But this is the point at which SAAMI draws the line. There are no standards for +P+ ammunition, it is simply “more” than +P.
Since the load is supposed to be still below the pressure of the proof cartridge, it should work fine once or twice in your gun. But prolonged usage will wear out your gun faster than +P. And the fact that there really is no official specification for +P+ means that there’s no way to really know what you’re getting. At that point, you’re putting your faith in your brand of ammo manufacturer to not overpressure the round too much, and your gun manufacturer to have designed the gun well. |
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发表于 2014-11-20 20:40
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