As already described, +P+ designates ammo that generates a higher chamber pressure than either standard and +P marked ammo generate.
+P+ ammo is generally made for specific users (such as a LEO agencies) who will insure that it is only used in suitable firearms. It is not meant for commercial sale, though in reality it is readily available at gun shows, on the Internet and such.
+P+ is potentially dangerous in the wrong firearm. Plus, being hotter it accelerates wear on a firearm. However, many LEO agencies use it in their handguns with no problems.
Quoted: ... For example, a 135gr +P+ could easily have a higher muzzle velocity than a 115gr target round (thinking 9mm here @ ~1100fps v 950fps, maybe) and I would predict, though I can't say for sure, that the increased mass would, in addition to imparting more energy, would also retain more velocity given similar coefficient of drag because of inertia. Can anyone confirm that?
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I’m no ballistics expert, but I think what you’re saying is a pretty safe bet.
That is, in general a fast moving, heavy bullet will retain more velocity than a slow moving, light bullet. If both bullets have similar ballistic coefficients, I believe this would be pretty much a certainty.
However, you’ve sorta reversed the usual comparisons, which generally involve slow moving, heavy bullets versus fast moving, light bullets.
Edited to add:
Palo_Duro, before you can make any really valid performance comparisons between the bullets you list, you also need to know the velocity of each round.