Lyman's Ammo Checker checks the quality and consistency of both reloaded rounds and purchased ammo. This checker is a gauge that allow a reloader to quickly confirm that their ammunition will fit in their chamber. It is made from solid blocks of 6061 T6 aircraft grade aluminum and cut with custom tooling to SAAMI minimum chamber dimensions. Size Small Rifle Type Cartridge Checker Series Small Rifle Gauge Weight 1 lb Caliber 204 Ruger/22 Hornet/223 Remington/22-250/300 ACC B Includes Caliber Engravings Quantity 1 Compatible With Small Rifle Calibers