Winchester 44 Rem Mag Unprimed Reloading Brass Winchester Headstamps New UNPRIMED Reloading Brass 100% Brass Casings 100 Count Factory|new brass comes unprimed and is always sold from the same lot. Winchester reloading components are custom designed and manufactured to precise specifications in order to deliver specific on target performance. These high quality brass cases are unprimed and ready for sizing.