Soups cans full of buck shot won't fit the tube, to big.
Besides soup cans full of buck are for when they are close, You break up the formation first with the beer cans full of cement, then when you see their bloodshot little beady eyes and smell their stinky breath, you let them have the cannister round...
CW next time I come that way I'll pick up a bag buckshot. We'll cut the top off a can, load the buck, then run the top down on top as a wad/cap...hey remember that turkey we saw....