The German army changed to the round nose bullet in 1918, apparently because there was concern that the truncated cone bullet could be considered a "dum-dum" bullet. I have not see any indication that feeding problems with the Luger pistol increased at that time.
The Luger has always been prone to feed problems, in part because of the same grip angle that is praised for its ergonomics. After moving the recoil spring to the grip, Luger changed the grip angle from the almost 90 degree Borchardt in an effort to get more positive breechblock closure, but (no free lunch) that resulted in a sharp angle to the magazine and less than optimal cartridge positioning.
Last edited by James K; January 17, 2013 at 10:35 PM.