Originally Posted by rcdinaz
okay now i am confused! i thought gravity was a constant and was negligible due to angle? horizontal distance, drift, rotation, what am i missing about effect of gravity for shooting?
You would be in error.
When shooting up or down at a high angle the drop of the bullet for each yard travled is going to be a great deal less than a bullet fired at a target at your same elevation.
Think of it this way, if you are shooting either stright up or straight down, the only real effect gravity has on the bullet is on it's velocity.
When fired paralell to the earth, the bullet falls at a predictable rate based on the pull of gravity. For each yard of forward travel, you have a specific rate of drop.