The weight of a projectile, specifically the bullet itself, is commonly measured in grains. One grain is a unit of mass equivalent to 1/7000th of a pound. Therefore, a higher grain number indicates a heavier projectile, while a lower number signifies a lighter one. As an example, a common 9mm bullet might weigh 115 grains, whereas a heavier bullet designed for increased penetration might weigh 147 grains.
The projectile’s weight directly impacts its trajectory, recoil, and terminal ballistics. Heavier projectiles generally exhibit more recoil, potentially leading to slower follow-up shots. However, they typically maintain momentum better over longer distances and may deliver more energy to the target. Historically, bullet weights were varied to optimize performance for specific firearms and applications, such as hunting different game animals or achieving desired penetration levels in military engagements.
