Missfeeding

I have 2 questions regarding Luger pistols.

1) Taking a recently acquired Luger to a firing range, I found the pistol misfeeding about once out of every 3 rounds. That is, after a round is fired, no cartridge was in the chamber. After cocking the gun, it fired 2 or 3 rounds OK when againâ??no feed. Also, every once in a while a round would jam in the chamber. It would go in crooked and have to be pried out. My son took the pistol to another range, where the manger claimed that because of the Lugersâ??s tightly machined parts, it has to be held very firmly during firingâ??a step short of a death grip. It all sounded like hogwash to me, but I canâ??t argue with the results. My son, following directions, put 100 rounds thru the pistol without a single missfeed, and only one jam, which the manager attributed to a faulty magazine. The pistol is a 1918 Erfurth (sp?) While the magazine is aluminum and probably WW2. Does any of this make any sense to you experts out there? Your comments would sure be appreciated.

2)I have no interest in collector quality Lugers would be interested in purchasing another good-shape Luger as strictly a shooter. Where would I start looking and how much can I expect to pay. Thanks again.