Generally for a given powder charge and bullet weight, a lead bullet will produce less pressure than a jacketed bullet simply because it is easier to push soft lead into the barrel than a copper or steel jacket. A consequence is that the max powder charge for the lead bullet is usually a little higher than for the jacketed bullet provided we are not getting into areas where we have leading problems.
The Luger is a recoil operated arm. The cartridge impulse is the figure of merit for operating the action. Pressure is totally irrelevant as far as operating the action is concerned.
Pressure is the figure of merit for operating a blowback action. The pressure curve becomes significant in operating a gas operated action since the gas is bled off through a port at some distance from the chamber.
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