But before we explain how that happens, let’s look at some of the commonly used 5.56 rounds, their bullet grain, and muzzle velocity. Bullet grain (gr) refers to the weight of the bullet and not the whole cartridge.īullet grain plays a significant role in the performance of a bullet. You may already know this by now, but it’s still important to point out. Those grains are where most shooters don’t stop in terms of bullet weight. There are some rumors about heavier bullets, but most people often stop at 77, 80, or 85 gr. There isn’t much hype around the heavier bullets that’s why you may not have heard of them.Īnd by the looks of things, we may even get a heavier one soon since manufacturers are always trying different reloading techniques. Most 5.56 bullet grains range from 40 gr to 112 gr. They have a slow muzzle velocity at 1050 fps. These rounds are designed to tumble in flight to cause a maximum wound channel.
The heaviest grain of 5.56x45mm ammunition is the Atomic Tactical Cycling Subsonic in 112 grain. But what is the heaviest grain 556 bullet? With much talk of twist rates, and bullet grain talk may occasionally broach the subject of what may be the heaviest rounds they fire. Between these two they pretty much have the sporting rifle caliber contest sewn up. 223 Remington, the most popular chamber caliber for an AR 15 is the 5.56.
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