I bought 7mm rem mag off of my nieghbor and it has an old 2-7 redfield scope on it with a range finder type reticle on the bottom right hand side of the scope as you look thru it right next to the reticle.How do you use the range finder?The only thing that I can think of is that when you adjust the scopes power the p.o.i changes with it.Is there anyplace that I can get on the web to find out about these scopes,it is about 25 years old give or take.I am going to ask my nieghbor tonight about it,hopefully he can tell me a little more about it.