My recipe is easy for cone 10 clay.
1 6 gal bucket of slop
1/2 bag of Lincoln Fire 60
3-4 large scoops of Lane 70 mesh sand
1 large scoop 35 mesh Grog
Then sometimes I add some granulated Magnatite when I want that spotted stoneware look.
Yields about $150lbs of clay in the walker. then I let it "sour" for at least a week and hand wedge.