[Thor]

I think the pattern I have seen is more random than typical, they almost always land in different spots. I think the key to the investigation is the STRENGTH of the ejection, you want them to come out a bit briskly but not launched 20 feet in the air. I know on many Artillery models with a new spring in them the ejection is so soft (too soft) that they kind of dribble out of the gun. In that case I usually test them with a little more powerful load which gets them up and perking correctly. Perhaps you can have someone fire the Luger while you watch the cases eject with the sun behind you to catch the brass reflection so you get an idea of how high they are going. I would say anything over 10' in height is too much.