The 25 GT cartridge is built on the 6mm GT case necked up to 25 Caliber. The 25 GT bridges the gap between the 6.5 Creedmoor and the 6 GT cartridge offering lower recoil than the 6.5 Creedmoor but improved ballistics over the 6mm bullets in the 6 GT. Each 25 GT 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. 25 GT brass utilizes small rifle primers. Each case is packed individually in a plastic flip top case with foam to product the brass during shipping and once loaded. Mfg: Alpha Munitions