I can only speak from personal experience, and hate to go against what our colleagues have to offer, but the one wild turkey I brined and smoked like I do domestics didn't turn out so good. I don't think it was the brine so much as the fact that it was a skinned bird, which I'm guessing your breasts will be. If I were to try it again, I would be sure to either leave the skin on (I hate plucking) or bard the meat with bacon or fat, or at least cover with strips of bacon to add additional fat, and keep the meat from drying out so much. Even my breasts were like jerky before. Good luck and keep us posted.