Alpha Munitions Ultra Premium Unprimed Brass Cartridge Cases .308 Winchester Brass - Small Rifle Primer 100/Box. When it comes to brass Alpha Munitions is committed to producing the highest quality most consistent rifle brass available. Alpha Grade means unparalleled consistency and performance you can trust. There is a lot to think about when you set your Mil or MOA hold-your brass shouldn't be one of them. Specifications for Alpha Munitions Ultra Premium Unprimed Brass Cartridge Cases .308 Winchester Brass: Manufacturer: Alpha Munitions Fabric/Material: Brass Package Contents: Alpha Munitions Ultra Premium Unprimed Brass Cartridge Cases .308 Winchester Brass Alpha Munitions AM308SRP100: Ultra Premium Unprimed Brass Cartridge Cases .308 Winchester Brass - Small Rifle Primer 100/Box