The list of calibers grains and diameters of Sierra Sports Master Handgun Bullets is quite lengthy. These bullets are perfectly engineered to offer consistent and reliable expansion over a wide range of velocities. One of the special features is the serrated power jacket on hollow cavity and hollow point bullets. Upon impact this feature allows the bullets to expand uniformly along the serration line creating maximum energy transfer and consistent weight retention. Regardless of the specific bullet needed Sierra provides an outstanding guarantee on the materials used and workmanship quality.