TIL shooting point blank mean shooting in a range where you don't have to account for gravity

Well for one bullets don't rise in flight by any noticeable amount. Bullets have an arcing trajectory because the barrel is pointed at an angle upwards in order to hit targets at a distance. If you shoot a pistol or rifle with the barrel completely parallel to the ground into an open and completely level field (not counting the natural curve of the earth) the bullet will have a noticeable drop in height from 20 yards to 50 yards to 100 yards with a high powered rifle, and a drastic notice in drop with pistols. If you have ever sighted a new gun in or a gun with new optics, you would know 95% of people sight in(aka zero) at 50 yards first, so they are relatively close to zero at 100 yards, but there will ALWAYS be a different point of impact in relation to point of aim between those two distances. If you are zeroed at 50 yards and you shoot another shot at 100 yards the point of impact will be different.

And not to be rude but it doesn't sound like you've ever shot a gun before. Because if you have you would know that there are no rifles that have zero bullet drop at 300 yards.

Another thing you can think of, is if a bullet is fired from any gun perfectly parallel to the ground, and a bullet that is the same weight is dropped from the same height, both bullet's will hit the surface of the earth at the same time, and I can guarantee you that using realistic muzzle velocities that the distance where gravity has a noticeable effect on point of impact in relation to muzzle height when being shot parallel to the ground is much much closer than what you stated them to be.

say that we are at a constant elevation of 1ft above sea level or something, but the elevation of the ground doesn't change at all above or below 1ft above sea level for the whole distance the bullet being shot is able to travel.

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