Re: Loaders not the same...
I wasn't questioning your experience or trying to contradict you in any way. I was simply tring to understand the situation, seeing that you neglected to include the details in your first post.
Having 3 different presses (RCBS Rock Chucker, Ammo master, and Hornady LNL Auto progressive) I am very familiar with having to readjust dies when switching between them, but the worst that can happen is that the shoulder will not get pushed back at all, or the press isn't able to cam over.
But the fact remains that your situation and setup isn't typical. Most full length sizing dies and shell holder combinations will not allow you to set the shoulder back to far, no matter what press you use them in, unless you have modified the die or shell holder or your chamber is atypical.
Now as far as the brass being ruined, I agree it is. But you didn't state that you had fired the brass, let alone sized them multiple times, and there was no mention of case head seperations. I had assumed that you had discovered the fact that the shoulders were set back to far through measurement, and had stopped there. My thinking was that you could simply neck up a few calibers then size back down to the proper dimentions, alot of work but allows you to salvage the brass, but obviously not going to work with your situation.