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: - 7. 62 X 39R - 6. 5 Grendel - Material: Steel - Extended: No