No. I’m not annealing. However I do recognize that some batches and brands of cases may be softer than others.
I also trim after sizing, but the problem seems to be with shoulder set back, not length. Like most reloader’s I don’t use a case gauge, I just full length size and trim to length which could allow for improper shoulder set back from stretching with the expander ball.
Those who beat their guns into plows, will plow for those who don't.-Thomas Jefferson