When sighted in as shown on the chart and using this load, the shooter can aim directly at small targets out to 69 yards, but the correct aiming point becomes uncertain at longer distances. Which sighting system is best depends upon the shooter. For shooters with sharp eyesight, a fine-bladed sight along with the center hold will allow them to shoot a squirrel in the head and aim directly at small targets out to at least 50 yards. This system has the advantage that the ball travels above the line of sight so you can clearly see the object you are trying to shoot, as it is not covered up and hidden by the sights. This is an additional advantage when light conditions are poor, or when the target offers poor visibility.
Adjustable sights have the advantage of being capable of being fine tuned for any situation.
They also have some shortcomings that are easily corrected. Also, except for the screwdriver slots, there is no way to keep track of the position of the adjustment screws or how far they are turned. The writer uses a high-quality steel ruler or depth gage to roughly measure the height of the rear sight, and then uses the adjusting screws for precision adjustment. Here's how the adjustments work on the writer's favorite rifle. A predictable amount of screw adjustment can fine tune the sight for different types of targets at different distances.