ycis. Forget the snapring. Find an O ring and put it around the grove in the ram, that will hold the shellholder in place and let the shellholder center in your dies better. Use an O ring pick or small screwdriver to pull the Oring down when you change shellholders. The snapring puts alot of side pressure on your shellholder and case. Myself and many others use the Oring trick. Luckus