Hornady

-.300 AAC Blackout-Specially modified to work with Lock-N-Load Precision gauges-A fine thread is used to attach them to the gauges, ensuring that they remain perfectly square for precise alignment in the chamber of your firearm-The neck of the case is made perfectly round & opened slightly to allow a standard diameter bullet to slip into the case mouth effortlessly, but concentrically, to ensure the most precise results possible