Be aware that any factory load in 9 mm Parabellum available today has an OAL that is shorter than the original DWM minimum OAL. (SAAMI maximum length is the orginal DWM minimum length. Any factory load I know of is shorter than the SAAMI maximum.) This is the cause of many magazine feeding problems. The Luger magazine works like a 22 LR magazine in that the bullet point must ride up on the front of the magazine at the correct angle. There should be no contact between the edge of one case mouth and the next while they are in the magazine.
Just because it says 9 mm Luger on the end flap doesn't mean it's really Luger ammo.
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