All I know is I have two owl calls-one wood barrel type one plastic reed one crow and a screaming peacock.I've used all of them more times than I can recall and the only times a turkey gobbled back at one was when it was still dark and I was within 35 yds.Regardless of the call I start with be it loacator or turkey I learned early on (meaning blew it) to already be seated against a good size tree ready for anything.Whether those few times they gobbled to the locator's was due to perceived threat or a "shock gobble" I cant say.