The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, commonly pronounced "five-five-six") is a rimless bottlenecked centerfire intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. [5] . It consists of the SS109, L110, and SS111 cartridges.

While the 5.56 NATO is not the typical long-range caliber, it has a relatively flat trajectory out to 500 yards thanks to its lightweight projectiles and relatively high ballistic coefficients. Depending on the load you're firing, you can expect a 55 grain FMJ to drop about 47” at 500 yards when zeroed in at 200 yards.

Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. Produces a ballistic trajectory chart and table that shows the drop, velocity, kinetic energy, windage, and trajectory of a bullet.

2023年2月2日 · 5.56X45 Bullets. The most common grain weights for the 5.56 NATO are 55 and 62 grains, with some heavier bullets maxing out at about 75 grains. The heavier bullets are fantastic for longer-range shooting and matches.

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Incredibly fast, with a muzzle velocity that’s generally more than 3,000 feet per second, you’ll find 5.56 ammo with a 62-grain projectile as well as lighter rounds with a common 55-grain bullet. In either case, you can expect muzzle energy to be in the ballpark of 1,300 foot pounds.