Three hundred AAC Blackout brass, sizing with no expander ball will nevertheless raise the neck rigidity in tons of the latter. For what It can be truly worth, sizing brass with no expander ball also goes a good distance toward keeping scenario necks straight, which typically brings about stable accuracy. https://felixzobmb.blogdal.com/38992519/5-simple-statements-about-300-blackout-reloading-explained