The X-10 Large Primer Tube Kit 3-Pack allows reloaders to pre-load 300 additional primers ahead of reloading sessions significantly improving overall round output and efficiency.X-10 Large Primer Tube Kit - 3-Pack Configuration100 primer capacity per tube for 300 total primer storageCompatible with any progressive press on the marketSpecifically designed for large primersEnables pre-loading primers ahead of reloading sessionsPerfect for serious reloaders looking to streamline their ammunition production process and maximize efficiency during extended reloading sessions.