I have called in a lot of deer with a grunt call but have never had any success with rattling. I dont do very much blind calling but I have called in a few that way. Most of the deer I've called in were deer that I saw first. I start off with a soft grunt and get louder until I know that he has heard it. Once he hears me I remain quiet until he makes the next move. If he comes I don't make another sound. If he continues the way he was going I grunt again. Usually takes 2or 3 times of this and he will come more times than not. It is kinda like you walking down the street and someone says HEY. You look around and see noone so you start back walking and they do it again. Most people will turn around and come back looking for who is doing it. Deer are the same way. It works better when the deer can't see very far because of thick brush or something blocking his view in your direction.