Originally Posted By: Plant.OneOriginally Posted By: GLShooterFrom what I'm seeing it is quite simply not bumping the shoulders back enough. If the die at MAX sizing is not doing that then one can cut the shell holder or shorten the die body to get more movement in the shoulder. The first is easier and cheaper and preferable IMHO. If you have a press with a rotating shell holder the die will need to be trimmed back. An oversize cut chamber has nothing to do with this issue if my experience over the past 45 years counts for anything.
Greg
or does the shoulder come forward during the body sizing part of the process and then get moved back by the shoulder portion of the die?
This in my opinion, from what was written in that first post, is exactly what's going on. Try it sometime, measure a shoulder, then resize with the die backed off 1/2 turn from where you normally have it set, and measure again. Not always, and it depends on your chamber dimensions compared to your die dimensions to a degree, but a lot of the time the shoulder is squished forward just a tad until the die pushes it back.
But heck, who knows it looks like the op was one and done on this thread.