You sneek up on them from behind and grab 'em by the tailfeathers!
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Seriously, This subject has been hashed and re-hashed by some of the best turkey hunters you'll ever come across right here on this board. Just do a couple of searches (look in the black section at the top of the page) and you should find volumes on the fine points of turkey hunting.

If you don't have any luck, come on back here and we'll gang-teach another fledgling turkey hunter.