There are some good tips here. I myself have used JB Weld, a 2 part epoxy kind of stuff and fill the cavity and with a piece of wax paper in between, I have been able to duplicate the shape of my bullets onto the seating die. No more rings, distortion or anything. I had to do the same thing to the top punch of my Saeco lubersizer, due to them not making any kind of top punch that would work for my shaped bullet . I always wish I had gotten a RCBS or Lyman when that happens, they have a better selection. :grin: