A unit of mass measurement, often referencing the projectile’s weight. This metric derives from the weight of a single grain of barleycorn. As an example, a typical 9mm bullet may weigh 115. This number signifies the projectile’s mass, impacting its velocity, trajectory, and energy upon impact.
The mass of the projectile is a critical factor in determining its overall performance. Higher projectile mass typically translates to greater kinetic energy and deeper penetration, while a lighter projectile may exhibit higher velocity and flatter trajectory. Historically, this measurement has influenced ammunition design and selection based on intended purpose, from hunting to target shooting and self-defense.