I've have a set of RCBS and Lee carbide dies. The Winchester brass will size easily in the carbide die but stick in the expander die and on the Federal brass I have the opposite situation. They are hard to resize but expand easily. Now, I believe it's the brass because the Winchester brass has been reloaded 7 or 8 times, but the Federal only's been reloaded 3 or 4 times. What do you think?