I used the Primos can last season with mixed results as well. Some bucks responded quickly but most of these deer were 2 1/2 years olds or younger. I have never had a big buck respond to the call but Mike Beatty sure did. I was told by a friend that I hunt with that the can call scared a giant buck away. He said he called once to the deer and it took off. One of the biggest bucks I have seen in years took off when I grunted at him. So I guess it just depends on the animal and how aggressive they are at the time. I going to continue experimenting with it.