LaserLyte LT-SWSM .270/300/325 WSM Rimmed Sleeve for LT-223 Rifle Trainer Cartridge Rimmed sleeve for the Rifle Cartridge Trainer LT-223 Gives young and first time shooters the opportunity to practice the fundamentals, as well as refine trigger control skills for shooters of all levels Rimmed sleeves are made of solid brass and work perfectly in all bolt-action rifles