The Lee Auto Breech Lock Pro utilizes special shell plates that will only fit the Breech Lock Pro, the reloading press will not accept any other shell plates. Auto Breech Lock Pro Shell holders utilize the same number as Lee Universal Shell holders and will fit the same cartridges. Specifications: Calibers: - . 223 Remington - . 223 Remington Match - . 223 Wyle - 5. 56x45mm NATO - . 223 Remington Ackley Improved 40-Degree Shoulder - . 222 Remington - . 222 Remington Magnum - . 32 H&R Magnum - . 32 S&W Long - . 380 ACP - . 380 ACP +P - Material: Steel - Extended: No