Hey Drew;
Maybe missing something. I just put in the variables you mentioned in the calculator you linked to. Sorry could't resist since you are from the "Show me" state. I put in 1.375 ounces of shot, 1295 fps, 8 lb gun, 33 grains for the wad just showed up in calculator, then put in 102.5393 grains of powder which is equivalent to 3.75 drams of powder. I came up with 67.4 foot pounds of recoil energy, not 32.6 lbs.
I could be wrong but 1 dram of powder is suppose to equal 27.344 grains of powder. That maybe the variable that is messing up. 3.75 times 27.34 equals 102.5393
Also my original calculator based on rifles did not account for wad weight, which might add to recoil a tiny bit.
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