Need advice for pull processing of Ultrafine Xtreme 400

[thambar]

Have several rolls of Ultrafine Xtreme 400 (which, sadly, has gone the way of Horn and Hardart's five-cent cup of coffee). I usually develop it at box speed (ISO 400) using the Massive Development Chart's recommendations of 14 minutes in D-76 at 1:1 dilution. However, I have to pull it one stop (to 200), so how long should I develop it for the lower effective speed? Thanks!

 

[Uncle Fester]

I would reduce the time by 30% as a starting point. Ultrafine Xtreme 400 is most likely rebranded Kentmere Pan 400.
I would test it by shooting a roll of Kentmere 400 at ISO 200 and developing it at 10.5 minutes in D76 1:1, If that works,
Develop the Ultrafine the same time.