I tryed this years ago just to see if it could be done. 6 point to 8 point on some 12 ga. Winchester 3 inch mag hulls. Tryed for hours, finally after ruining 10 or 12 hulls gave up that idea. Even tryed using a butter knife to start each segment with a new steel 8 point crimp starter. Guess I only got a hand full that even looked right. If anybody out there knows how and can do a good job of it, I am all ears.