The Luger, UrbaN MYTHS, Firing out of battery, tc.
The Luger WILL fire out of battery. I've done it several times with the simple experiment of using a primed case. (One presumes it would get ugly with a fully loaded cartridge.)
The Luger probably has more urban myths surrounding it than any other fire arm you can name. Starting with its supposed lack of reliability. About two years ago I and two other people started a serious research project to separate fact from fiction. (Sort of ala the Myth Busters, but with a an awful lot of historical research thrown in.) Hence the experiment above. It has been slow going what with having to actually make springs, magazine parts, etc., acquire enough data on things like measured barrel diameters to be statistically significant, digging through old drawings and records, some in German (Thank God at least one of us has enough German.) some hard to come by. I suppose some day a book may come out of this.
We are not accepting hear say, we find out the actual facts. Another experiment on my part was putting together a test rig to actually measure the strength of recoil springs, both at preloaded and fully loaded lengths. I've measured a lot of springs, both originals and modified ones.
Some real eye openers have occurred along the way.
1. Contrary to what you often see in print, Luger barrels do NOT vary widely in internal diameter. In fact they were held to tighter tolerances than are common in US made sporting arms.
2. When you buy a box of 9 mm "Luger" cartridges, they ain't really Luger cartridges. Some where along the way, some bright boy decided the SAAMI maximum OAL should be the same as the original DWM MINIMUM OAL. We do not as of yet have an answer as to why or how this happened. However, it's the starting point of the Luger's supposed unreliability. The Luger magazine operates like many 22 LR magazines in that the nose of the cartridge rides on the front of the magazine and keeps some space between cartridges to allow for the larger diameter at the rear of the cartridge. (The 9 mm is tapered.) There is no commonly available cartridge today that actually meets spec.
3: This should be obvious, but most of these pistols are pushing 80 years or more. Many of the magazines have been dropped on their head once too often.
4: The 9 mm Luger does NOT need a hot load. Nor does it need a weaker recoil spring to accommodate today's commercial loads.
5: On the other hand, Winchester, Fiocchi, et al, 7.65 cartridges are seriously underloaded. To the point of not having enough steam to reliably cycle the action. Winchester claims 1220 fps, but I defy you to get anywhere close to that with a real pistol. I called up Winchester on this point and I have to say they were not very cooperative. They claim 1220 fps from a 4.5 inch test barrel. As opposed to DWM's original spec of 1220 fps from a 120 mm barrel on an actual pistol. The Winchester stuff will not get close to 1220 fps even from a six inch pistol. Fiocchi's is slower yet. This point required a research project of its own into how bullet velocities were measured circa 1900.
(I have a Ruger P89 chambered for the 7.65 Parabellum as a test control gun. I have a Ruger Blackhawk chambered for 9 mm Parabellum for using up reload experiments that did not work well in the Lugers.)
6: No two shooter grade Lugers will have identical recoil springs. They are usually cut down originals or some after market spring. This due to their having been tinkered with by the ignorant. A Wolff replacement spring doesn't even LOOK like a Luger recoil; spring.
7. In the 1906 US Army trials the Luger actually beat the Browning design in the reliability tests. Georg Luger then went on to supply the famous 45 caliber Lugers for the next round of trials. But by then it was becoming obvious the Luger suffered from the "Not Invented Here" syndrome. But the Swiss, the Germans, the Portugese, The Finns, the Dutch, Iran, et al adopted the Luger. The Germans, Swiss, and Finns are not famous for machinery that doesn't work.
Little known trivia: The grip screws are not metric, they are British Standard.