The 22 GT cartridge is built on the 6mm GT case necked down to 22 Caliber. The 22 GT offers similar benefits of the 6 GT but with higher velocities and flatter trajectories with the smaller 22 caliber projectile all with even less recoil than the 6 GT. Each 22 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. 22 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