I have shot quite a number of Gobblers using a wooden tube call, based on the Old Quaker Boy tube call. Last year shot both my Gobblers using my tube Gobbler call, first one first Monday and #2 first Friday. Both birds were in open fields. First one with half dozen hens, and some other longbeards & jakes. The second one by himself, he gobbled once, I gobbled back, and he came in on a string, and at 25 yds. shot him.
You need to keep safety in mine, and would be very careful using it on Public land.