Roast Turkey - How to get the meat to fall off the bones
I would assume that cooking at low heat for a long time would help get the right texture, kind of like how cooking a pork shoulder for 8 hours low and slow turns it into pulled pork. You might also want to add some liquid for your turkey to braise with - If it doesn't have enough moisture, the meat will tighten up, dry, and contract. If you braise it, it will absorb some cooking liquids. Not sure if braising a turkey is a great idea, though.