Adam Painchaud of the Sig Sauer Academy talks about holdover and offset in the latest training tips video from the National Shooting Sports Foundation. A red dot sight or a scope is zeroed for a specific distance. If shooting a distance that is either greater or less than the zeroed distance, you need to compensate for it in order to get an accurate hit.
Adam discusses ways to determine the holdover and offset for your rifle. This becomes important in a defensive situation when you are using a rifle at close range. It is also important if you are in a competitive match such as a 3-Gun competition.