Either Universal, 3.5 grains or Unique, 3.8 grains with (Montana Gold, Hornady XTP) 95 gr JHP's gives good results in both the Ruger LCP and Walther PPK/S.
The Unique load as it is an easy one to remember -- 3.8 gr in the 380, giving around 950 fps. 3.8 grains of the flake powder also fills the 380 case without compression and is impossible to double load.
As with all semi-auto pistol loads, a taper crimp to keep the bullets from shifting in the magazine from the force of the pistol's recoil is a very good idea. If the bullets shift, compressing the load in a small capacity, high pressure cartridge, the results can be very dangerous.