#Nightforce ballistic program pocket pc full#

#Nightforce ballistic program pocket pc full#

= 435 yds.) This gives you the corrected distance as if you were shooting on a flat plane, with the full force of gravity affecting the bullets path of flight.īelow, referencing a. To obtain the bottom leg of the triangle, you would multiply the cosine number of. Here you can see the sloped distance to target equals 500 yards and the angle that the hunter is holding on is 30 degrees (cosine number of.

The surveyor notes the angle that he is holding at, then goes to his data book and obtains a cosine number of that angle, which he then multiplies to the sloped distance. His/her goal is to obtain the base of the triangle distance, or flat line distance. The theodolite tells the surveyor the angle of his aim. As an example, when a surveyor is shooting a mountain top for mapping purposes, he uses an instrument called a theodolite. The first method is called the field expedient “Rifleman” method. However there are three ways to obtain this and one is more accurate than the other. Now, this is an easy adjustment a simple equation that will put you very close to right on target. It is imperative that when we are shooting up or down on an angle that we eliminate the guesswork, and correct the straight line distance to the target or “sloped distance,” to the, corrected for gravity, distance to target. However, when we shoot on an incline or decline (up or down on an angle) the force and effect of gravity is less on the bullet but the sight height above the bore of the barrel remains the same, or adjusted for shooting on a flat plane.īecause of this, the bullet will have a flatter trajectory and strike the target higher than where our intended point of aim was. In order to zero properly and get the bullet to strike the bulls-eye, we need to adjust the sight height above the bore of the barrel for this particular condition, (shooting on a flat plane) so that when the bullet leaves the bore of the barrel it arcs up into the full force of gravity, and then drops down onto the bulls-eye.

When we zero in our rifle at 100 yards, we are shooting on a flat plane with the full force of gravity pushing down on the bullet.

The reason for this has to do with gravity and the adjusted site height above the bore of the barrel. Sheep hunters and deer hunters alike know all to well, that if their target is up or down on an angle, that they must aim low because the bullet will impact high. Shooting on angles is what every hunter experiences while hunting in mountainous terrain. There is a physical ballistic problem encountered when shooting on angles that causes the bullets point of impact to hit high.