I am currently reloading Lee Cast 9mm 126 grain TC tumble lube bullets. I have encountered a yawing/tumbling problem with this bullet. At loads of 3.0 to 3.3 grains of Bullseye, there is little or no problem at 25 yards with this bullet. These loads will shoot approx. 3" groups from the bench. When I go from 3.4 all the way up to 4.2, the yawing turns into a complete sideways entry of the bullet into the target (tumbling). The heavier the charge of powder, the more of the bullets that will tumble. At 4.2 grains of Bullseye, almost all of the bullets I will shoot will enter the target sideways, thus leaving the bullet profile cut through the target. The same thing occurrs with Titegroup powder. Anybody else have this problem with tumble lube bullets. No wisecracks about tumble lube bullets are supposed to tumble. Suggestions anyone???? I have not chronographed any of these charges to see what the actual velocity is. 4.2 Bullseye should be just under 1,100 fps.