Hal I just don't know if his theory really works,you know as well as I do that a turkey may be on fire ready to die one morning and the next henned up or just not in the mood,there are different factors everyday that may affect the birds behavior and killability like the weather may suck or predators in the area may have them tight lipped or skiddish or he may get separated from his hens and may run over you looking for them,you just never know,then theres birds that'll gobble a 100 times and not come to you and then there's birds that will gobble 10 but come on in,so his Theory on calling them to "guage" if they are killable or not don't make sense to me just because the slightest change in something will make them act different from day to day