I saw upon final proofread that you are talking cast lead bullets... and I was under the "assumption" that we were talking plated as you experiment a lot with plated. I saw that before I submitted the post but then figured, MEH, it's still decent information.
In any case, from the same Western 3.5 Edition printed guide, there is some lead bullet data for a 200gr in .44 Mag using AA#7, but there is nothing under 220gr for lead in AA#9.Accurate#7 in .44 Magnum, using a 200gr lead RN FP slug
start at 15.3gr for 1,229fps
MAX of 17.0gr for 1,397fps
MAX pressure of 34,800psi
COAL of 1.560 with same primer and test barrel
Now, here is some BONUS PUBLISHED DATA, but (as with any load data from any source...) please be careful with this and keep in mind where it comes from...
I have a couple older printed guides and some of the data is at least interesting... or even useful, simply for the knowledge base.1992 Accurate Loading Guide, Fifth Edition
Lightest lead slug is a 215gr bullet and I would absolutely
feel safe using this data with a bullet that is lighter by 15 grains (all other safety rules being followed, of course)215gr lead, AA#7, in a Ruger Redhawk with 7.5" barrel, CCI-300 non-Mag primer
start at 16.4gr for 1,335fps
MAX of 18.2gr for 1,500fps
MAX pressure NOT LISTED IN THIS GUIDE
COAL also not listed^DATA IS FOR 215gr LEAD
, expect higher velocity and/or lower peak pressure if you substitute a 200 grain lead slug