EddyBo, the flight pattern of a bullet apon exiting the muzzle is not a constant. For instance. A rifle with a 200 yd zero will produce 2 intersections of the scope line of sight and the bullet flight. If the scope is 1 1/2 " above the barrel the bullet exits the muzzle 1 1/2" below the line of sight. Somewhere around 50 yds the lines will cross basically achieving zero. At 100 yds you might be 1" high. Again at 200 the lines intersect again achieving zero.
You can run the same bullet and load threw the different rifles both with a 200 yd zero. Will the first intersection appear at the same distance. The answer is not nessasarily. The reason behind this is Bullet Flight Patterns. When a bullet exits the muzzle it responds somewhat like a curve ball and can be effected less or sometimes more depending on whether the bullet exits at the top of or bottom of a pressure node.
A little about bullet flight pattern......When a bullet exits a muzzle it first curved downward then curves upward. How drastically the bullet curves upward can sometimes under the right circumstance be effected to a much greater degree though it doesn't happen that often. Because bullet intersection varies at the first point of impact means you can not rely on the scope height measurement. The scope height measurement is simply a trajectory figure. When bullet flight patterns are in effect throwing a sharper......in this case....upward curve ball....the trajectory is greater than the scope height figure you are useing. The scope height figure cannot be relied apon. Physics however and BC's can.
Change your scope height figure and when you put in the number that identifies the true trajectory your chart will fall into perfect alignment to way out there.
Shod
