ORIGINAL: sabotloader
Cdaddy
Yep, I think we have a real live discussion... gravity is gravity... and steep angles are steep whether they are uphill or downhill - get your range finder out - if it has a ballistic scale it will show you what I am talking about. It will read one range for a flat range and it will read another range at steep angles whether they are up or down...
You aim lower.
http://www.exteriorballistics.com/ebexplained/article1.html
"Inclined fire" is a shooting situation in which a gun is first sighted in at a shooting range that is level or nearly level, and later must be fired at a target located either upward or downward at some inclination angle and some slant range distance between the shooter and the target. An upward inclination angle is called an elevation angle, and a downward inclination angle is called a depression angle. This is the sort of situation that sometimes confronts a hunter in mountainous terrain with steep hillsides and deep ravines. It is a frequent situation for a soldier or marine in urban combat, or a sniper shooting at distant targets. It also occurs for a law enforcement officer or a SWAT (Special Weapons and Tactics) team member in an urban venue.
In such a situation a gun will always shoot high compared to where it shoots on a level trajectory. How high the gun will shoot varies with both inclination angle and slant range distance to the target. The problem facing the shooter is how to determine how much the impact point of the bullet will change at the inclination angle and slant range distance, and then to adjust his or her aim so that the target is hit. Adjusting the aim can take place in either one of two ways. A hunter will usually aim a little lower for an inclined shot than he or she would aim for a horizontal shot, in order to compensate for the gun shooting higher.
A simple illustration:
Pardon the poor graphics. If a gun is sightedfor 100 yards on level ground when aiming at a target on an incline 100 yards away by LOS (rangefinder) then the bullet will drop as if you were shooting at the distance on the horrizontal line. Obviously the steeper the angle the greater the difference. Without a specific angle and elevation I can only guess at the proper distance for my drawing. It's mainly meant to illustrate the point.
A compensating rangefinder will show the true horizontal distance.