Originally Posted by rscott5028
I remove the expander and use a bushing calculated to leave my ID .002" undersize relative to the bulet OD not accounting for springback
Whenever you pull brass from a sizing die, it's going to immediately springback to counter your sizing. You can calculate it, predict it, & you'll see it.
Blanko, the number of cycles before shoulder bumping or body sizing is 'required' for good chambering, depends on cartridge design, your chamber tolerances, and your load pressures.
You might have to body size everytime, or never. Just have to measure & keep an eye on it.