The Hornady 6mm/243 Caliber Gas Checks are essential components for bullet casters looking to enhance cast bullet performance with crimp-on gas seal technology.Hornady 6mm/243 Caliber Gas ChecksCrimps securely to base of cast lead bullets during sizingSeals gases and protects bullet base from deformationPremium quality construction from trusted Hornady brandPackaged 1000 per box for extended useThese gas checks are the preferred choice for serious bullet casters who demand reliable performance and protection for their custom cast bullets in 6mm/243 caliber applications.