I used the calculator for my 12 and .410 loads. My 12's are $4.34 a box. My .410s are $3.76 a box. My wholesale source for both shells is $5.30 a box for Federal Top Gun 12s and $9.19 a box for AA .410s. The saving per box is $.96 a box for the 12 gauge and $5.43 a box for the .410s. The saving for 20 and 28 would probably be proportionate, since we use about the same shot charge for 12 and 20, 7/8 ounce, and the 28 and .410 should be very close too. I say that because my normal 28 gauge load is 11/16 ounce, a bit less than the normal 28 gauge load. The counters on my 28 and .410 loaders, installed a few years ago, show about 30,000 shells loaded. The savings rounds off at about $6000 to $6500. I am willing to reload for that savings, although combined with the big gun savings, may not be worth the effort, since the big gun savings is not that much. The realistic saving may not be more than a couple of dozen skeet shoots. However, without the reloaders, we could not load the specific loads we choose to shoot. I have no idea how I could acquire the loads I have required over 55 years of loading without having a loading room and loading my own shells.