We were a little shy on the volume, mixed approx. calibrated equipment, and a big immersion cooler, I was not familiar with. I think we had about 5 gal. bittered, and yielded about 4.5 in the fermenter.
We did a full boil, and indeed, diluting a more concentrated wort boil would yield somewhat less IBU. That's not my big concern now. I'm concerned at the great range in IBU I got from the differennt calculation sources. Maybe I should go to Tinseth, but it should be a relative measure, which is how I've always treated it.
The Rager 60 vs. 80 is botheriing me, and I rechecked my inputs for BeerSmith, there was a small pot selected, so I selected a larger one, and got 83 instead of 105 IBU, which makes no sense to me, but it does get closer to my 80 IBU from Pyle's equations.
Anyone know of a good source for the Tinseth formulas? Thanks,