Technical Overview of the .17 HMR Cartridge The .17 Hornady Magnum Rimfire (HMR) has had a significant impact on rimfire ballistics since its introduction in 2002. Developed by necking down a .22 Magnum case to take a .17 caliber bullet, it was designed to provide a high-velocity, flat-shooting alternative to traditional rimfire rounds. Ballistic Performance and Characteristics
: The cartridge typically launches a 17-grain bullet at muzzle velocities exceeding 2,500 feet per second. This high velocity contributes to a very flat trajectory over distances where other rimfires begin to drop significantly. buy 17 hmr
: Designing semi-automatic actions for .17 HMR is more complex than for other rimfires. Manufacturers have developed specialized delayed-blowback or gas-operated systems to handle the pressure curve safely and prevent premature case extraction. Technical Overview of the