This requires cases to be especially thin, limiting rimfire cartridges to low-pressure loads. “ Rimfire” refers to ammunition that’s primer is ignited by the firing pin crushing the base’s rim. What to Consider When Choosing a Handgun Caliberīefore getting into each specific revolver and pistol caliber, here’s some information that’s useful for making a decision. 45 GAP, and 10mm are also fairly commonly used. Though these are the most popular calibers, options like. The table below shows the common velocity range, common energy range, common bullet weights in grains (gr), and a rough price range for bulk brass cased ammo for each caliber: Caliber 9mm (9x19mm Parabellum, 9mm NATO, 9mm Luger).Today’s most popular handgun calibers are: Though there are hundreds of different handgun cartridges that have been used in the past and continue to be used presently, the list you’re most likely to come across and choose is much shorter. With that said, gun shop employees are familiar with the misuse of “bullets” and will be able to help you figure out what you want to buy. If you’re buying ammunition to shoot at your local range, you can say “I want to buy a box of 9 millimeter ammo” rather than “9mm bullets” to be precise. To be clear, caliber refers specifically to the diameter of the bullet, not the case/casing that holds the bullet, powder, and primer. The entire round is referred to as a “cartridge.” Though rarely labeled correctly in movies, television, or media, a “bullet” specifically refers to the metal projectile.

45 ACP has a diameter more than 2.5mm greater than 9mm. This can sometimes be confusing to newbies because without knowing this, you might assume 9mm is larger than something referred to as “Forty-Five A.C.P.” The reality, however, is that. 45 ACP has a diameter of 0.451 inches and 9mm has a diameter of 9.01 mm. It can be measured in both inches and millimeters (mm). Really quickly, let’s cover what a “Caliber” is.Ĭaliber is a measurement of a bullet’s diameter. The truth is, however, there are many viable options each with their strengths and weaknesses.īelow, we’ll explore the most popular revolver and pistol calibers to help you compare them and choose what’s best for your needs and abilities. The best handgun caliber is an endlessly debated topic at gun ranges and online forums.

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