since blind calling the last 6 deer I got 5 where bucks,,, BUT I keep it to an absolute minimum!
I do a quick 1/2second single grunt every 20 to 30 minutes and thats it,,, someone mentioned when you do that you are being hunted too and they are correct so you need to sit motionless and if you can't do that then do not grunt.... BUT I have had many Bucks run right to my tree and even look up at me and not spook,,, about a month ago a week before the season opened here I walked into my stand with my regular clothes on and no camo just rubber lacrosse boots,,, I climb into my stand and while in a T shirt, black jeans and even drinking a coffee from a travel mug I grunted once and there where two bucks maybe 40yds away! they both came right to the bottom of my stand and 1 looked right into my eyes and just sniffed around looking for the other buck...
I have never grunted and had a deer spook,,, BUT I have climbed down to leave the woods after last light to get blown at or spook deer so they do come in looking hard and very quiet so listen for them chipmunk foot steps.
my buddies nicknamed me Doeboy until I started blind calling,,, my call of choice is the deer extinguisher
http://www.illusionsystems.com/shop/extinguisher-deer-call/ because its not a loud call.