[Zizz]

I don't think there is a need for the turn bet to be so large. What does that bet accomplish that a smaller bet wouldn't do better? Betting close to half the pot will price out any hands he is drawing with and will chips if he does in fact have the J. Betting close to half the pot also does NOT commit you to the pot. Depending on his action to the bet you will have a good idea if he has the J or not.