- Hornady is the name you have come to trust when it comes to high quality ammunition. This particular load, designed by Hornady, is one of the hardest hitting rimfire cartridges currently on the market. Designed around a lead free projectile this specialty round generates 2525 fps from the muzzle which translates to 236 ft/lbs or energy. The NTX stands for Non-Toxic Expanding bullets using a lead free core and proprietary metals formed through aunique compression process.