Regarding the traditional inconsistency of Gerstley, I heard that when Laguna bought the mine and reopened it, they mined a bazillion tons of it, ground it, and put it all in a huge warehouse where they shoveled from end to end with dump loaders until it was all uniform. Thus, they now have many years supply of a consistent product. The analysis is slightly different (and published on their website) than before, but it is now a known quantity and reliable product. If anyone has heard differently, please advise.
Yes, the current supply is supposed to be pretty consistent. We've had a lot of conversations here about Gerstley, some quite heated. I started using Gillespie when it came out and just kept with it.