The chart shows, not states, no such thing as charts don't talk! The chart shows a person sighting in a 30-06 with a typical hunting bullet AT 170 Yards so it is approximately 3" high at 100 yards and that results in approximately a 3" drop at 210 yards in the illustration. Looking at the trajectory of the bullet it is approximately +1" at the 25 yard marker on it's way to that 170 yard zero. That is what many call the MPBR (Maximum Point Blank Range) where you could shoot at an animal at any distance from the muzzle out to 210 yards and not be more than +/- 3" from where the crosshairs are aimed. In other words it would always be within a 6" circle, which is generally less than the vital zone of big game. Now these expensive scopes with adjustable turrets have built in compensation for long range shooting and can be/are made for a particular load so that the crosshairs can be held right on the target at whatever distance is dialed into the elevation turret. The same thing is done if one has a windage turret to compensate for bullet drift. The scope crosshairs may be on the target, but the barrel is pointing up from the horizontal position and to the right/left of the target depending on the wind. If a barrel is held in a horizontal position, a bullet starts a downward path as soon as it leaves the barrel and it never goes above the axis of the barrel. Obviously that is why the barrel must be elevated to a higher and higher angle/position from horizontal in order for the bullet to be on target as distance to the target increases.

zrexpilot---4 clicks at 25 yards is normally 1/4" of movement on most scopes and for every 25 yard increase in distance it will take one less click, such that at 100 yards it would only take 1 click to move the bullet 1/4". I'm not disputing that.