Cost per shell means nothing without factoring the number of shots an individual takes. For instance, my son struggles. He pushes a box in a half maybe two to get his birds. He just cant get the timing down and ends up turning a lay up shot to a hero shot simply by waiting to long to pull the trigger. I average about a half a box to shoot a limit. At $35 a box that costs me about $18 a hunt to shoot bismuth. It costs me about $24 a hunt for my son to shoot two boxes of steel. I agree, if it took me a box plus to shoot my 7 birds I would never consider the other options.