Re: Bumping Shoulders Issue
Statjunk, I'll try and explain in a little better detail.
First, I would deprime your cases. Then take your measurements from case head to the datum line using your pm. You should start to see more consistent readings. When setting up your die, back it off a little for starters, remember the threads are course and a little goes a long way. When I am setting up dies, I leave the lock ring lose and backed off so I can turn the die in very small increments, measuring each time. You may only turn the die an 1/8 turn or so to get into the right area, and then just a very slight bump/turn while fine tuning it. As you are adjusting it, you may even see your shoulders grow as the case is being resized and brass flows into the shoulder, in this case just screw it down a bit more. You want to fine tune the position of the die to only bump the shoulder back a small amount. Don't worry too much about where the bottom of the die is in relationship to your shell holder.