I watch a young six do it last year. It was either him or the spike. The 6 was the one posturing and all, so I guess it was him. So yeah, immature bucks can do it too. That was the one and only time I've ever heard it. I killed the biggest deer I've killed with that call the first time i used it. I called blind too. I have seen other bucks respond well to it also. Really thought it was just a gimmick.