I haven't had that kind of penetration like you did mainly because the type of shot never presented itself, however I have been using them in my 264 WM and 300 H&H at top velocities with excellent results on deer and antelope. None have stayed inside those animals shot.
The worst angle I had was on a mule deer shooting the 300 H&H with 180s. I thought the deer was more broadside then he was so at 100 yards the bullet hit the deer in the shoulder angling up into the neck, breaking it and exited. I don't know how much it penetrated before exiting, but basically from the center of the shoulder to the front half of the neck.
