Okay, it helps if I look in the right filing cabinet in the shop . . . anyhow, here is some data and notes I found on reloading 44 Magnum with 200 grain cast bullets. Apparently, according to my notes, I HAVE reloaded some light magnum rounds with 200 LSWCHPs. My notes also say that I didn't like them much and recommended working more on a comparable 44 Special load using the same (200 gr cast bullet).
I think I ended up with something like 5.8 of Bullseye pushing that 200 gr LSWCHP, but would have to double-check. I've long since moved away from the 200 gr cast bullets to the 240 gr bullets--I seem to have better success with longer range silouhette shooting with them.
So, here is the data I dug up:
44 Magnum 200 gr cast bullets
Unique 6.8--897 7.8--1045
HP38/W231 5.8--875 7.4--1039
Hope this helps or gives you a safe starting point.
Jeff