Because lead is a soft substance, the odds of a pellet ricocheting are far lower than with a BB. Pellets ricochet, but the majority of their energy is lost on hit. Pellets have a significantly more aerodynamic form, which allows them to be incredibly precise. A domed or pointed pellet is ideal for hunting. Rounds with flat surfaces are used for training since they do not produce discernible holes. Binary bullets are made of two parts: a core and a coating. The core can be solid (such as brass) or hollow (like steel). Hollow cores are cheaper to make and use less material, but must be loaded into weapons designed for solid-core bullets. Steel balls coated in tungsten are used by some hunters to kill large game such as elk and moose because they will go through muscle and bone and come out the other side. Tungsten weights about ten times as much as steel, so using too many of these bullets could cause your gun to malfunction due to lack of weight. However, this is not a problem when hunting small game where one accurate shot is all you need. Brass shells are the most common type of bullet available. They are made of a copper alloy that is hardened with zinc. Brass has a low melting point (1,718 degrees F), so it is easy to work with while still being resilient enough for impact with animal flesh.