I don't know a damn thing about non toxic shot in a 20 gauge but I think it's great that a college professor wants to learn to hunt and that you're willing to take him. Best of luck to both of you.
Thanks gents for the info and encouragement. I'll be taking the neighbor out within the first few days of turkey season (opens here April 15). If I can get him on a bird I'll post a pic to this thread. I thi k he and his family would be thrilled