Hornady Lock-N-Load Cartridges 6mm GT .243in Diameter. Specifications for Hornady Lock-N-Load Cartridges: Manufacturer: Hornady Quantity: 1 Color: Silver Fabric/Material: Steel Features of Hornady Lock-N-Load Cartridges: Allows the user to check their cases and ammo to ensure a correct fit Ensures a SAAMI camber fit Helps the user to prevent damage to his chamber due to incorrect cartridge sizing Must have safety tool for all reloaders. Package Contents: Hornady Lock-N-Load Cartridges The Hornady Lock-N-Load Cartridge Gauge .308 Winchester .308 Diameter 380716 is a quality addition to the Hornady lineup. For more great deals on Reloading Measuring Tools by Hornady please browse our Hornady Reloading Equipment page. Hornady 380725: Lock-N-Load Cartridges 6mm GT .243in Diameter