I had an aquaintance with similar problems. He asked me to try it out and tell him what I thought. He was using some of the highest power ammo safe to use, still getting misfeeds. First off, if the gun is EJECTING with no problems, your ammo is sufficiently powerful. The bolt is indeed traveling to its furthest possible extent, for otherwise the spent cases will not eject at all. As in your gun, the gun I inspected was not FEEDING properly. The first thing I did was to take apart the grips, et cetera as suggested above. The only thing I could think of was the magazine. However, it was NOT a spring problem. I have the original magazine for my luger, and it functions flawlessly with any ammunition, including hollowpoints (a rare quality in a luger). after lining the two mags up exactly, I noticed an anomaly. His magazine held the cartridges in a different position. The difference was almost too little to notice, but I reshaped his mag feed lips until the cartiges fit exactly the same. This solved the problem. The gun went from misfeeding every other round to one misfeed in sixty seven rounds. This with handloads and hollowpoints. Inspect your mag carefully, see if this helps. Concerning the hold open: the catch engages in a shallow cutout on the bottom of the bolt, not on the face as with some automatics. If this notch is rounded at all, or if the hold open catch is rounded on its rear edge, it will jerk out of place with the power of recoil. Hope this helps.
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