>>3203574Try and find a film that is common between your developer and a more well known one - this can give you a good starting point.
For example if the time and dilution for tri-x at box speed in rodinal is similar to your developer, you might try using the Rodinal time and dilution for kentmere 400@1600.
Or you could just use Rodinal - pic related is 1+50 and kentmere 400 @ 1600.