This is a great generic bratwurst recipe, and wild turkey meat is a fine base for sausage. But wild turkey is as lean as meat gets, so fat is a critical factor.
This recipe seeks a 70/30 mix of meat to fat. Some folks prefer a little leaner, 80/20. Adjust the meat ratio to your own satisfaction, making sure to add the total of meat and fat into the “Servings” field to be certain all the other ingredient amounts are correct.