DOPE stands for "Data On Previous Engagements." Basically, it's information you record about ammunition loadings, wind conditions, humidity, scope settings, angle of shot above or below horizontal, etc. that lets you better estimate the point of impact of the round you are shooting through the rifle you are using.
What is moa in target shooting?
MOA stands for the Minute of Angle, which correlates to the minute hand of a 360-degree clock face. Each minute refers to 1/60th of a degree, similar to the minutes of an hour. When shooting, even a slight angle can cause you to miss the mark, so fine-tuning your MOA to the precise angle or “minute” is important.