In this context, a "hot" load refers to the impulse, not the pressure. The Luger will handle quite a bit of pressure, no sane load is going to over pressure it. On the other hand, excessive impulse will over stress it. The impulse is a function of bullet weight and velocity, with a bit extra thrown in for powder weight and gas velocity. As stated above, a normal load should be adequate, there is no need for a "hot" load.
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