I have do not have a three dot on my horton, I have a multi range scope on my 175 max. My one friend got a new legend 150 ( I think) last fall and it came with a three dot horton scope also. If I rember right the top dot, which should be the bigest is centered and on top and the they all go down from their and get smaller. I had him use the top/big dot for twenty yards and adjusted his sights for the top dot. When we were done the next dot was right on thirty and the bottom one was on forty. When you adjust the scope Im not sure if all three adjust together but I it seemed like they did. His top was on twenty and the rest were all right on. Was going to get a three dot when my new CB came this year but I fell in love with my multi rectical scope. Hope this helps.