The AmmoMaster 2 single stage press has been improved with the installation of the longer support columns and larger toggle block found on the RCBS AmmoMaster .50 BMG press. While still set up to use standard 7/8-inch-14 thread dies and standard shell holders to load most any pistol or rifle caliber, the addition of the .50 BMG 1-1/2-inch Die Kit (88705) will allow reloaders to load from .25 ACP to .50 BMG. For original AmmoMaster owners wishing to load .50 BMG, two kits are necessary. The .50 BMG 1 1/2-inch Press Conversion Kit and the .50 BMG 1 1/2-inch Die Kit.