There is a weird guy that I often encounter in my game. He is tight, and he actually often folds to raises, if he has limped, or re-raises, if he has raised, pre-flop. I think basically that he folds all hands except JJ+ and AK to re-raises. I have never seen him cap.
Now, what would be the optimal range to re-raise him with pre-flop? Right now I am doing it with 67s+, KTo+ and all pp.
Oh, and we're talking 1/2 full ring.