loogout1,

The pin acts like the adjustable pin that is used by target shooters. The difference being that the range starts at 50 yds and then up.

You sight the pin in at 50 yds. Then, using the dial adjust the pin to the next point where it clicks into place. For me, 3 clicks gets me to 60. After a while you get the hang of how many clicks is what distance. You can also use the sticker. However, I've found it easier to learn what the distances are through practice. You can set the pin anywhere in it's travel range without using the "lock-in" locations. In that regard it is a little like a pendulum in that it has a wide range of use.