The .22 Savage High Power (HP), also known as the 5.6×52mmR, is a centerfire rifle cartridge that was introduced in 1912 by the Savage Arms Company. This cartridge was developed for the Savage Model 99 lever-action rifle. It features a rimmed, bottleneck case design, which allows it to be used effectively in both bolt-action and lever-action rifles.
The .22 Savage HP is known for its flat trajectory and high velocity, characteristics which make it suitable for varmint hunting and medium-sized game, such as deer and antelope. It typically fires a 70-grain bullet at a velocity of around 2,790 feet per second, delivering considerable energy for its size.
Despite its initial popularity, the .22 Savage High Power has largely fallen out of favor in recent years, primarily due to the advent of more modern cartridges that offer superior ballistics and versatility. However, it still retains a niche following among collectors and those who use vintage firearms.
The cartridge can be relatively hard to find, given its decline in mainstream use, which may require enthusiasts to seek out specialty ammunition suppliers or handload their own rounds.