Yes you are right about the pins. Alot of people use only one pin and have great results. They hold over for longer or under for shorter shots. A 5 pin is usally set at 20 or 25 then 30,35,40,45, Or tailer to your own shooting style and ranges.Many like the simplicity of one pin, in the fact that you'll never use the wrong pin for a certian yardage.