I've killed many a turkey, and never shot one with a shotgun. Most have fallen to my 222 during spring, and a couple to my 7-08 during deer season. I shoot them all at the base of the neck.
I know some will criticize us down here for using rifles on turkey. But any I have ever shot during spring season were within shotgun range. I just choose to carry the rifle in case we run up on some pigs while turkey hunting, which happens quite often.
Jay