Like any calling, works sometimes with certain deer. Other times, will blow them out of the country! Nothing works all the time. I have personally snort-wheezed at a 180+ giant, he ran away. My buddy Tyler had the same experience with a 190 class buck last year - just the way it is sometimes. Next monster we see may come running straight at us - you just never know - but if it's the difference between trying and not, I'll try!