I was experimenting with some heavy jacket (.050) HAWK bullets today in the 350 Rem Mag.
They use a very soft lead core and tip. They shoot just fine when loaded singles into the chamber, ,,,,
HOWEVER,,, look what happen when they were fed via the magazine. The lead tips get whacked due to the crappy Ruger feed ramp. (which I already improved by a great margin)
And they fly off in a predictable pattern depending on which number they are in the magazine.
I then loaded some soft tip Speer 250 grain spitzers and the same thing happened. Here is a photo of the groups and the numbers show which shot it was.