Sometimes Tinseth can be almost twice as much as Rager. The formulas are all bad, so it's best to pick one and stick with it, understanding that there is more to the bitterness we perceive than isomerized alpha acids, and MUCH more than a poor deterministic approximation thereof. I use Rager, personally.
The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Planned: Fat Man Porter, sLambic II, Brettennial Falcon IPA, Flanders Red, Orange Blossom Mead
Primary: Winexpert Riesling Ice Wine, sLambic I
Secondary: Flanders Red
Kegged:Black or Blue EyePA, Cherrywood-aged Crystal Stout,
2013 dump volume: ~2 gallons