I recently purchased a Walther PPQ with a 4" barrel, and the manual says not to use +p+ ammo. I am a fan of the 9mm 124gr GD so I tested the factory Speer 124gr +p against Uderwood 124gr. +p for highest velocity. I understand that this only represents a couple of lots, but the Chronograph indicated that the Speer factory was averaging 1,192 fps and the Underwood load was averaging 1,243 fps. I will miss the nickel case, but I am going to use the Underwood load. Additionally, there was much less spread in velocities with the Underwood load. In the real world they both will work just fine, but I wanted to pass it along.