I had a similar problem with mine. I found a doc on the internet, which I purchased. It was an e-book about lugers. It mentioned that the ammo in a luger clip does not lie flat upon each other like other mags. The cartridges are LONGER than the standard. A factory load is about 1.5" long. These lie flat on top of each other in a luger mag. The Luger was designed so that the base of each cartridge touches the one above and below it. BUT the bullet point rides on the side of the magazine. That means that each cartridge is on a slightly higher angle than the one below it. (or in other words, the cases are not touching each other except for the very base). I tried various lengths and found that a cartridge length of about 1.8" was about right. And since then, with the standard springs and all, it seems to work reliably. By the way, this also explains why hollow points don't work well, and why Lead round nose bullets jam.
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