The Luger has a very odd ejection characteristic. Although extraction is straight up, the ejector acts on the lower right quadrant of the cartridge base (seen from behind). This ejects the cartridge up and to the left, where the shell mouth actually hits the left receiver extension on its way out. On fired 9mm brass you can see a flat spot on the casing mouth where this occurs. Obviously the trajectory from there can be pretty random.
I don't shoot .30 cal., so I don't know how it might affect this.
--Dwight
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