I rate JC200 at 200. I develop using either the 2:2:100 or 1:1.100 dilution depending on whether it will end up as a PtPd or Silver (Azo). Beautiful film! Any deviation from 200 is so slight in my case that I do not bother with exact calibration. In fact, I find the film with Pyrocat to be so forgiving that I am able to not be bothered with exact (to the second) development times. How do you meter your scenes? Do you use low and hi EVs to determine SBRs? My typical "normal" scene registers an SBR of 9 and I develop for 6m30s using the 2:2:100 dilution.