300 AAC Blackout brass, sizing with no expander ball will even now boost the neck tension in tons of the latter. For what It can be value, sizing brass without the expander ball also goes a good distance toward preserving situation necks straight, which generally ends in sound accuracy. Some https://lorenzosdnwg.blogzet.com/the-5-second-trick-for-300-blackout-cases-52566624