The 115 grain bullet at 1025 fps was intended for the "old" model Luger with the flat recoil spring. Around 1904 the "new" model luger with the coiled recoil spring came out and the 9 mm load was stepped up a bit.
The Mauser Lugers are not "buffered". Nor are they stronger, unless perhaps the metal is better. Pressure is not the real concern when avoiding wear and tear on the gun but rather cartridge impulse. Excessive impulse will tend to do things like knock the toggles off.
In today's world these are "fun" guns or collector pieces so there is no sense abusing the gun with hot loads. Sufficient steam to reliably work the action is enough steam.
The cartridge OAL is the thing to worry about for reliablity. All available factory ammo today is too short, although a few seem to work such as the above mentioned Wally World Winchester load. If you hand load than you can set the correct QAL.
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