Re: trouble chambering resized cases
Are you pushing the shoulder back on the cases as you resize them?
If you aren't resizing enough (not pushing the shoulder back), you will actually be pushing the shoulder forward as you size the body of the cartridge (this makes the case longer).
Measure a fired brass from base to a point on the shoulder and then measure a resized brass to see if you resizing them enough.
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives