The cartridge OAL relates to the magazine, not the pistol itself. Some after market magazines do not have the original dimensions. In fact it has occured to me that in late years some magazines may be shorter front to back to accomodate today's shorter factory ammo. In any case, the nose must rest on the front of the magazine so that there is a small air gap between the case mouth and the cartridge under it.
It's a mystery to me as to how it came about that today's ammo is shorter. I can see no advantage in shortening it.
Shooter grade Lugers tend to have all sorts of non-standard recoil springs in them. The various springs in a Luger are a delicate balancing act.
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