The Luger does lack case support in the ramp and lower breech face area, but this is a common to most self loaders. If there is enough pressure to blow out, that's where it will blow out.
But keep in mind that the design pressure (intended max working pressure) for the action is not that of the service load but the proof load!! This unsual situation came about because the working load for the original carbine ran the same pressure as the proof load for the pistol. The leads to the fact that if you gradually heat up the load the toggles will fail from too much impulse before the action fails from too much pressure. (The carbine's much heavier barrel and extra recoil spring controlled the greater impulse of the carbine load.)
|