This is John’s mom’s recipe and it works well with our home-grown wheat flour.
(makes 3 loaves)

Blend:
6 cups white flour.
3 cups whole wheat flour.
3 tablespoons baking powder.
1 tablespoon sugar.
1 tablespoon baking soda.
1 tablespoon salt.

Cut or rub in:
½ cup shortening.

Beat and mix in:
3 eggs.

Add:
3 + cups buttermilk. (or 2/3 cup buttermilk powder added with dry ingredients plus 3 + cups of water added later.

Work the mixture on a floured board.  After forming into three oval-shaped loaves, cut a line down the centre of each one, approximately ½ inch deep.
Bake at 350 degrees for approximately one hour.