The most important factors to note are the mass of a bullet, measured in grains (gr), and the velocity it will travel. In addition to differing bullet diameters, handgun calibers are loaded to different specifications from one another. Failure to do so could result in the catastrophic failure of your gun and even severe injury to the shooter or bystanders. You should always refer to the owners manual of your firearms to be sure what ammo can safely be shot from them. With very few exceptions, you can only safely shoot a particular caliber from a firearm chambered specifically for that caliber. When we say “ bullet,” we’re specifically referring to the projectile shot from a firearm, not the entire cartridge which includes the bullet, case, powder, and primer.
45 ACP has a bullet diameter of 0.451 inches. 9mm Parabellum ammo, for example, has a bullet diameter of 9.01 mm and. Handgun CalibersĬhoosing a handgun chambered in the right caliber for your needs and shooting ability is the most crucial decision you’ll need to make.Ĭaliber is a measurement of a bullet’s diameter, measured in either inches or millimeters (mm). This guide will fill you in on everything you need to know to choose your first handgun confidently.
You also may not be entirely sure what terms like “caliber” mean or what the differences are between pistols and revolvers. If you’re in the market for your first handgun, you may be feeling overwhelmed by all of the different available options.
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