We’ll be talking about AR15s, zeros, trajectories, and gravity. Fortunately we will not be talking about shooting in zero gravity as bullets would fly forever, or at least until they crash into the drifting hulk of the Discovery One.
Fortunately, it’s not as complicated as deciphering the true meaning of White House press briefings, as long as you understand how bullets fly.
Bullet trajectory is almost as simple as dropping a brick, except the bullet flies forward where a brick just drops towards the ground. When you fire a bullet, there is no magical force that helps it defeat gravity. In fact, if you fire a bullet from your AR type rifle, perfectly parallel to the ground, the bullet you fire will end up hitting the ground at just about the same time as a bullet you let fall from your hand straight down. I say, “just about” only because the earth curves a bit, and the fired bullet will have a smidge farther to fall than the dropped one. It’s that gravity thing we just can’t defeat, no matter what.
No matter how fast a bullet is flying, it’s constantly falling towards the ground. Even bullets fired from those so-called “High-Powered Assault Weapons.” If you look at the path of a bullet, it will always be a downward sloping curve, kind of like congressional approval ratings.
But wait, you say, when I aim right at a target 100 yards away, the bullet hits it! That’s correct, but only because the barrel is actually pointed a little bit upwards relative to the ground. Shooting a bullet is a just like throwing a football except you don’t get 12 million a year plus a signing bonus. You need to aim it up a little bit so it arcs back down to intersect at your desired impact point.
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