I tried 4.6 grains of Unique behind the 100 grain Plinker. Doesn't have enough steam to cycle reliably in either a Luger or a Ruger. This is not to say Unique is a bad powder for the cartridge, just that you need to use a bit more of it.
I got tired of wimpy factory loads and bought the Ruger P89 in 7.65 in hopes I'd have something to empty the factory loads with so I could reload them for the Luger. Ruger furnishes a softer recoil spring for the 7.65 than for the 9 mm.
The factory loads do not cycle any better in the Ruger than in the Luger. If you happen to stumble across a left over box of Remington/Peters I suspect they are loaded a tad stiffer than Winchester or Fiocchi. At least some Peters went through the Ruger with out a hitch although the ejection was not what you'd call vigourous.
The original carbine load ran 1400 fps from the actual carbine (as opposed to a test barrel) with an 11 inch barrel. This was an average velocity from about 5 feet in front of the muzzle to about 105 feet from the muzzle. Note that this is not the same thing as muzzle velocity, it would correspond to a muzzle velocity on the order of 1450 fps or better. This load ran about the same working pressure as the proof load for the plain pistol, on the order of 40,000 cup.
While the turn of the century methods of measuring velocity were quite different from today's, and yielded slightly different numbers, they were quite accurate. We can assume the measured average velocity across the trap was very close to the true average velocity across the trap.
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