Ok I need some help. I recently bought a redding type S full length sizing die for my 7mm Rem Mag. I am using Winchester brass and it is twice fired. I set the die to bump my shoulder back to what should have been .002". After running 37 cases through the die and measuring them as I went I got very uncostitant results. Out of the 37 cases 14 didn't bump the shoulder at all, 7 bumped .001", 8 got bumped the desired .002", 4 at .003", 1 at .004", and 3 at .006". Now everything was tight and nothing should have moved after I had thought to have set my die where I wanted it. I also know that all of the brass has been touched by the die because the die is leaving a small ring around the base of the shoulder, not deep but you can feel it with your finger and it will catch your fingernail. Has anyone had this experience or have any suggestions for me?