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If you want to kill the old toms with big spurs I have found the best way is to pattern them and catch them coming from or going to their roost, or in one of their strut zones.Seems like most of the Toms I have called in and killed have been 2 year old birds.
Scout,scout,scout, set up where they want to be. Learn how to use several calls... Dont call to much...
I like to follow Al around. He scouts a lot so there are always lots of birds around him. So my advice is to find someone with more birds then they know what to do with and spy on them. Let them hunt the area and warm up the birds, wait for them to leave and sneak in and wait for them to come looking for him. Easy as pie.