In several places, the LASC guys discuss the same thing I mentioned: That WW consistency has gone to crap over the last 15+ years, and that you can't count on anything being a predictable alloy or BHN, or even being uncontaminated. Their recommendation is the same as mine - alloy in the largest batches you can safely handle, watch out for contaminated WW ("new" production), and test the alloy afterward.