The Alpha 6mm BR brass is available with a Small Rifle primer pockets and ships in 100 count custom Alpha Munitions plastic cases with perforated bi-layer foam for protection of cases during shipping and can be used for loaded ammunition. Each 6mm BR case produced by Alpha Munitions also incorporates the company's OCD with optimized case head technology, which is designed to lengthen primer pocket life, as well as the life of the case overall, even at higher than normal pressures and velocities. Mfg: Alpha Munitions