More than likely, no adverse wear on the pistol..
More info below. This information is copied from one of Chuck Hawks web pages.
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Non-standard "+P" Ammunition
How about the "+P" cartridges for calibers such as the .32 ACP and .380 ACP that are offered by some specialty ammo makers, such as Buffalo Bore? The answer, as far as I can determine, is that there are no SAAMI standards for +P ammunition in these calibers.
Ammunition so labeled is not true +P. It is either loaded to the standard SAAMI MAP for the cartridge (perhaps right at the upper limit), or loaded to higher than permissible (thus potentially dangerous) pressure. The former is a marketing gimmick to stimulate sales and the latter (over-pressure loads) are not safe for use in all guns and may degrade your pistol's reliability and longevity.
Almost all .32 ACP and .380 ACP semi-automatic pistols are blow-back operated, not locked breech designs. In these pistols only the mass/inertia of the breech bolt and the pressure of the recoil spring keep the action closed during firing. These are carefully calibrated to the anticipated pressure of the cartridge for which the pistol is chambered. Any increase (or decrease) in the cartridge's MAP can create an unsafe and/or unreliable condition.
In other words, these cartridges are intended to be loaded within a narrow range of pressures that cannot be exceeded if the guns designed to shoot them are to operate correctly. Since any handgun used for personal protection must, above all, be reliable, I recommend against the use of ersatz "+P" ammunition. Stick with ammunition loaded to SAAMI specifications.
A different situation is represented by hot .45 Long Colt revolver loads, such as the Cor-Bon .45 Colt +P, which Cor-Bon clearly states is not loaded within the SAAMI pressure limit for the .45 Colt cartridge. This over-pressure ammunition is equivalent to the loads listed in most reloading manuals that are intended for use ONLY in Ruger Blackhawk and T/C Contender pistols.
These loads are unsafe in other .45 Colt revolvers and specifically should not be fired in S&W N-frame revolvers, Colt Single Action Army (P-frame) revolvers or copies of such. The SAAMI standard MAP for the .45 Colt is 14,000 psi and .45 Colt +P ammunition is reportedly loaded to about 27,500 psi, a 97.4% increase in pressure! At almost double the standard pressure, these .45 Colt +P loads are far in excess of even the heaviest proof loads and are likely to destroy guns not specifically designed to handle them.
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Conclusion
Compared to standard pressure loads, +P ammunition generally provides a useful increase in velocity and stopping power. The difference is much less than between standard and magnum calibers, but it is real. There is also an attendant increase in muzzle blast and recoil, but it is usually moderate.
Conversely, the improvement is not so great as to make +P ammunition mandatory for successful personal defense. In particular, handguns designed only for standard pressure ammunition should not be fed +P loads.
The limited performance advantage offered by using +P ammunition is more than offset by the attendant decrease in reliability and the potential for gun damage. Self-defense firearms must be as close to 100% reliable as possible. A gun that malfunctions may get you killed. Gaining a few percentage points in theoretical stopping power is certainly not worth the risk of catastrophic failure in a life and death situation. By far, the most important factor in stopping power is bullet placement, not cartridge power.