Buck I shot this year, came from about 250-300 yrds, across open field right to me. I Grunted 3 times, and then waited. After first grunt his head went up and looked right at me.
I have a Knight and Hale Translator
http://www.knightandhale.com/product...?id=9443941167
But I have used it at other times, and bucks show no interest, so its hit and miss with callling.....