I killed a Rio north of WaKeeney on Friday and he didn't make a sound. But he did come to the calling. But it was so windy, he couldn't hear me at 200yds. I had to close the distance so he could hear me. I got him in the evening about 20mins before sunset. Don't give up! You have all of May, they will start talking again when more of the hens are bred. The cold will shut them up too.
Gselkhunter