Well I finally got the Luger shooting. Someone had taken a real nice matching number 1916 Erfurt and put a 30 Kal. Luger barrel on it,and it was jamming every shot. Changed magazines, no improvement, changed ammo, same result. Started cutting coils off the spring with no improvement. Stopped after taking 3 coils off to get more advice. Someone wrote me and said that his 30 Kal. Luger only had 17 coils on it and I realized that I had taken 3 coils off and still had 22 coils left. So I took it down to 19 coils and tried it and it ran like a sewing machine. How someone got that spring in the pistol, is a puzzle to me. Took me 2 days to get back in after I took it out the first time.
Remember nothing is foolproof as fools get more creative when challenged.
Thanks to all who gave me advice