Originally Posted by AJ Peacock
Press alignment is tough to measure and is unlikely to be the cause. A shade tree mechanic method of seeing if the threads on the top are straight with the ram is as follows.
I agree. I certainly have no clue. So I asked the Redding tech guys for some ideas at one point and the following was suggested:
"You can perform a test to see if the runout is caused by an equipment problem. Make a mark on the cases at the base. When inserting them into the shellholder, line the mark up with a certain point on the shellholder or reloading press. Then when checking concentricity, see if the mark on the case always corresponds with the concentricity high and low points."
Not a "high tech" type solution, but a way of possibly learning something about the alignment of the press.