Take a Guess
Some events are known-distance shoots, in which the targets are set at given distances and rangefinders are allowed. But most are "unknown," and the shooter must judge the yardage without a rangefinder. These make the best practice for hunters. Yes, you probably use a rangefinder in the field, but your next buck may not give you time to use it. Sanctioned shoots typically set targets at a maximum of 50 yards, but plenty of club shoots stretch that out to 100 or more.