One of the most popular sizes around, often a great choice for your first handgun. . It is officially known as the “9x19mm Parabellum” or “9mm Luger” to distinguish it from other 9mm rounds, but most commonly you will hear it called “nine millimeter” or “nine mil”. This is an excellent range and self defense firearm, and the standard round for NATO countries as well as dhe majority of police forces around the world. This mild-shooting round can be found in varying stopping power’s based on bullet type choice, thus many nine-mil owners opt for hollow-points.