Ok, I give up....hopefully someone can figure this out or point out what I'm missing here.
It seems all the sudden that I the shoulders on my 22-250AI loads aren't getting bumped back at all when I FL size them. Measuring my dummy round that was used to set the headspace and throat the chamber way back when with the chamber gauge Fred made me, I get 1.530".
My newly reloaded ammo (Norma brass) is all measuring 1.532".
My fired brass (from above reloads) is all measuring 1.530" to 1.532"
What got me looking at all this was the fact that every round I fired today required a substantial amount of force to get the bolt closed. At first I figured the bullets were just seated a little long and were jamming into the rifling, but upon returning home that proved not to be the case. Even setting the bullets 0.020" deeper didn't lesson the hard bolt closing and the bullets aren't making contact with the rifling in the chamber gauge made with the same reamer that cut the barrel chamber.
The only thing that has changed is the press I'm using. Same dies and shell holder as I have always used, and the die is set so the ram bottoms out on the die as it should, but as the numbers above indicate the sizing die doesn't seem to be bumping the shoulder back 0.002" like it should. What's even stranger is that on about 1/3 my fired cases the shoulder is one or two thousandths shorter than it was when it was loaded.
The only rational explanation I can come up with is spring back in the brass after resizing.