Something I learned from JB: To prevent expander ball induced case stretching, you can neck expand in a separate step (after sizing without the expander ball stem in place) by running the case UP into the sizer die with a lowered expander ball. Lubricant inside the case neck is still needed. I suppose there's a chance of case shortening or some shoulder setback with this method. JB says the above described method keeps the neck straighter (if your sizeer die is reamed straight), too. -Mark & Belle
