Hornady"s universal shell holders are precision machined from solid steel then heat treated to perform flawlessly for the life of the press. Improvements include a wider mouth and a rounded edge at the opening to allow smoother case insertion. They fit all other Hornady accessories including the Case Trimmer and Hand-Held Priming tool.Hornady shell holders also fit most other brands of reloading presses. This shell holder works with; 257 Weatherby Mag., 6.5 Remington Mag., 264 Winchester Mag., 270 Weatherby Mag., 7mm Remington Mag., 7mm Remington Short Action Ultra Mag., 7mm Weatherby Mag., 7mm Remington Ultra Mag, 7mm STW, 300 H&H, 300 Winchester Mag., 300 Weatherby Mag., 300 Remington Short Action Ultra Mag., 300 Remington Ultra Mag., 308 Norma Mag., 8mm Remington Mag., 338 Winchester Mag., 338 Remington Ultra Mag., 340 Weatherby Mag., 350 Remington Mag., 358 Norma Mag., 375 Remington Ultra Mag., 375 H&H, 416 Remington Mag., 458 Winchester, 450 Marlin, 458 Lott.