This dedication to quality ensures proper seating of the bullet both in the case and in the chamber and consistent charges and pressures. The result is optimal velocity and repeatable accuracy from your cartridges. This is a wildcat cartridge and is not listed by SAAMI. The 475 Linebaugh is a shortened version of the 45/70 Government, usually used in 5-shot revolvers. New, unprimed brass. This is not loaded ammunition.